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Finding the Fourth Proportional to 754.92, 1,130.31 and 638.73

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Solution

The fourth proportional to 754.92, 1,130.31 and 638.73 is: 956.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.92 : 1,130.31 = 638.73 : x
  2. Step 2: Convert to fraction form
    754.92/1,130.31 = 638.73/x
  3. Step 3: Cross multiply
    754.92x = 1,130.31 × 638.73
  4. Step 4: Simplify right side
    754.92x = 721,962.91
  5. Step 5: Solve for x
    x = 721,962.91/754.92
  6. Step 6: Final answer
    x = 956.34

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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.