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Finding the Fourth Proportional to 63.87, 88.17 and 39.31

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Solution

The fourth proportional to 63.87, 88.17 and 39.31 is: 54.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.87 : 88.17 = 39.31 : x
  2. Step 2: Convert to fraction form
    63.87/88.17 = 39.31/x
  3. Step 3: Cross multiply
    63.87x = 88.17 × 39.31
  4. Step 4: Simplify right side
    63.87x = 3,465.96
  5. Step 5: Solve for x
    x = 3,465.96/63.87
  6. Step 6: Final answer
    x = 54.27

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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.