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Finding the Fourth Proportional to 638,145.90, 957,218.85 and 323,217.90

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Solution

The fourth proportional to 638,145.90, 957,218.85 and 323,217.90 is: 484,826.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,145.90 : 957,218.85 = 323,217.90 : x
  2. Step 2: Convert to fraction form
    638,145.90/957,218.85 = 323,217.90/x
  3. Step 3: Cross multiply
    638,145.90x = 957,218.85 × 323,217.90
  4. Step 4: Simplify right side
    638,145.90x = 309,390,266,537.42
  5. Step 5: Solve for x
    x = 309,390,266,537.42/638,145.90
  6. Step 6: Final answer
    x = 484,826.85

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Double scale
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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.