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Finding the Fourth Proportional to 638,146.90, 957,220.35 and 323,218.90

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Solution

The fourth proportional to 638,146.90, 957,220.35 and 323,218.90 is: 484,828.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,146.90 : 957,220.35 = 323,218.90 : x
  2. Step 2: Convert to fraction form
    638,146.90/957,220.35 = 323,218.90/x
  3. Step 3: Cross multiply
    638,146.90x = 957,220.35 × 323,218.90
  4. Step 4: Simplify right side
    638,146.90x = 309,391,708,584.62
  5. Step 5: Solve for x
    x = 309,391,708,584.62/638,146.90
  6. Step 6: Final answer
    x = 484,828.35

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Half scale
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Double scale
Find fourth proportional to 638,147.90, 957,221.85 and 323,219.90
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.