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Finding the Fourth Proportional to 63.54, 87.71 and 39.92

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Solution

The fourth proportional to 63.54, 87.71 and 39.92 is: 55.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.54 : 87.71 = 39.92 : x
  2. Step 2: Convert to fraction form
    63.54/87.71 = 39.92/x
  3. Step 3: Cross multiply
    63.54x = 87.71 × 39.92
  4. Step 4: Simplify right side
    63.54x = 3,501.18
  5. Step 5: Solve for x
    x = 3,501.18/63.54
  6. Step 6: Final answer
    x = 55.10

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.