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Finding the Fourth Proportional to 637.40, 956.10 and 431.30

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Solution

The fourth proportional to 637.40, 956.10 and 431.30 is: 646.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    637.40 : 956.10 = 431.30 : x
  2. Step 2: Convert to fraction form
    637.40/956.10 = 431.30/x
  3. Step 3: Cross multiply
    637.40x = 956.10 × 431.30
  4. Step 4: Simplify right side
    637.40x = 412,365.93
  5. Step 5: Solve for x
    x = 412,365.93/637.40
  6. Step 6: Final answer
    x = 646.95

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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.