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Finding the Fourth Proportional to 63.47, 87.76 and 55.28

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Solution

The fourth proportional to 63.47, 87.76 and 55.28 is: 76.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.47 : 87.76 = 55.28 : x
  2. Step 2: Convert to fraction form
    63.47/87.76 = 55.28/x
  3. Step 3: Cross multiply
    63.47x = 87.76 × 55.28
  4. Step 4: Simplify right side
    63.47x = 4,850.80
  5. Step 5: Solve for x
    x = 4,850.80/63.47
  6. Step 6: Final answer
    x = 76.42

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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.