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Finding the Fourth Proportional to 637.61, 956.41 and 421.13

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Solution

The fourth proportional to 637.61, 956.41 and 421.13 is: 631.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    637.61 : 956.41 = 421.13 : x
  2. Step 2: Convert to fraction form
    637.61/956.41 = 421.13/x
  3. Step 3: Cross multiply
    637.61x = 956.41 × 421.13
  4. Step 4: Simplify right side
    637.61x = 402,774.28
  5. Step 5: Solve for x
    x = 402,774.28/637.61
  6. Step 6: Final answer
    x = 631.70

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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.