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Finding the Fourth Proportional to 63.92, 88.14 and 55.70

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Solution

The fourth proportional to 63.92, 88.14 and 55.70 is: 76.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.92 : 88.14 = 55.70 : x
  2. Step 2: Convert to fraction form
    63.92/88.14 = 55.70/x
  3. Step 3: Cross multiply
    63.92x = 88.14 × 55.70
  4. Step 4: Simplify right side
    63.92x = 4,909.40
  5. Step 5: Solve for x
    x = 4,909.40/63.92
  6. Step 6: Final answer
    x = 76.81

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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.