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Finding the Fourth Proportional to 657.92, 987.32 and 247.39

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Solution

The fourth proportional to 657.92, 987.32 and 247.39 is: 371.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.92 : 987.32 = 247.39 : x
  2. Step 2: Convert to fraction form
    657.92/987.32 = 247.39/x
  3. Step 3: Cross multiply
    657.92x = 987.32 × 247.39
  4. Step 4: Simplify right side
    657.92x = 244,251.24
  5. Step 5: Solve for x
    x = 244,251.24/657.92
  6. Step 6: Final answer
    x = 371.25

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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.