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Finding the Fourth Proportional to 63.14, 87.16 and 42.40

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Solution

The fourth proportional to 63.14, 87.16 and 42.40 is: 58.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.14 : 87.16 = 42.40 : x
  2. Step 2: Convert to fraction form
    63.14/87.16 = 42.40/x
  3. Step 3: Cross multiply
    63.14x = 87.16 × 42.40
  4. Step 4: Simplify right side
    63.14x = 3,695.58
  5. Step 5: Solve for x
    x = 3,695.58/63.14
  6. Step 6: Final answer
    x = 58.53

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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.