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Finding the Fourth Proportional to 63.92, 87.64 and 63.25

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Solution

The fourth proportional to 63.92, 87.64 and 63.25 is: 86.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.92 : 87.64 = 63.25 : x
  2. Step 2: Convert to fraction form
    63.92/87.64 = 63.25/x
  3. Step 3: Cross multiply
    63.92x = 87.64 × 63.25
  4. Step 4: Simplify right side
    63.92x = 5,543.03
  5. Step 5: Solve for x
    x = 5,543.03/63.92
  6. Step 6: Final answer
    x = 86.71

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.