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Finding the Fourth Proportional to 638,165.40, 957,248.10 and 217,339.80

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Solution

The fourth proportional to 638,165.40, 957,248.10 and 217,339.80 is: 326,009.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,165.40 : 957,248.10 = 217,339.80 : x
  2. Step 2: Convert to fraction form
    638,165.40/957,248.10 = 217,339.80/x
  3. Step 3: Cross multiply
    638,165.40x = 957,248.10 × 217,339.80
  4. Step 4: Simplify right side
    638,165.40x = 208,048,110,604.38
  5. Step 5: Solve for x
    x = 208,048,110,604.38/638,165.40
  6. Step 6: Final answer
    x = 326,009.70

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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.