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Finding the Fourth Proportional to 63.31, 87.14 and 54.59

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Solution

The fourth proportional to 63.31, 87.14 and 54.59 is: 75.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.31 : 87.14 = 54.59 : x
  2. Step 2: Convert to fraction form
    63.31/87.14 = 54.59/x
  3. Step 3: Cross multiply
    63.31x = 87.14 × 54.59
  4. Step 4: Simplify right side
    63.31x = 4,757.36
  5. Step 5: Solve for x
    x = 4,757.36/63.31
  6. Step 6: Final answer
    x = 75.15

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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.