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Finding the Fourth Proportional to 73.92, 101.78 and 62.88

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Solution

The fourth proportional to 73.92, 101.78 and 62.88 is: 86.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.92 : 101.78 = 62.88 : x
  2. Step 2: Convert to fraction form
    73.92/101.78 = 62.88/x
  3. Step 3: Cross multiply
    73.92x = 101.78 × 62.88
  4. Step 4: Simplify right side
    73.92x = 6,399.93
  5. Step 5: Solve for x
    x = 6,399.93/73.92
  6. Step 6: Final answer
    x = 86.58

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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.