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Finding the Fourth Proportional to 637.62, 955.21 and 431.18

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Solution

The fourth proportional to 637.62, 955.21 and 431.18 is: 645.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    637.62 : 955.21 = 431.18 : x
  2. Step 2: Convert to fraction form
    637.62/955.21 = 431.18/x
  3. Step 3: Cross multiply
    637.62x = 955.21 × 431.18
  4. Step 4: Simplify right side
    637.62x = 411,862.67
  5. Step 5: Solve for x
    x = 411,862.67/637.62
  6. Step 6: Final answer
    x = 645.94

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Double scale
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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.