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Finding the Fourth Proportional to 657.31, 987.38 and 414.01

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Solution

The fourth proportional to 657.31, 987.38 and 414.01 is: 621.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.31 : 987.38 = 414.01 : x
  2. Step 2: Convert to fraction form
    657.31/987.38 = 414.01/x
  3. Step 3: Cross multiply
    657.31x = 987.38 × 414.01
  4. Step 4: Simplify right side
    657.31x = 408,785.19
  5. Step 5: Solve for x
    x = 408,785.19/657.31
  6. Step 6: Final answer
    x = 621.91

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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.