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Finding the Fourth Proportional to 987.92, 1,481.76 and 621.56

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Solution

The fourth proportional to 987.92, 1,481.76 and 621.56 is: 932.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.92 : 1,481.76 = 621.56 : x
  2. Step 2: Convert to fraction form
    987.92/1,481.76 = 621.56/x
  3. Step 3: Cross multiply
    987.92x = 1,481.76 × 621.56
  4. Step 4: Simplify right side
    987.92x = 921,002.75
  5. Step 5: Solve for x
    x = 921,002.75/987.92
  6. Step 6: Final answer
    x = 932.26

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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.