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Finding the Fourth Proportional to 73.92, 110.11 and 73.78

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Solution

The fourth proportional to 73.92, 110.11 and 73.78 is: 109.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.92 : 110.11 = 73.78 : x
  2. Step 2: Convert to fraction form
    73.92/110.11 = 73.78/x
  3. Step 3: Cross multiply
    73.92x = 110.11 × 73.78
  4. Step 4: Simplify right side
    73.92x = 8,123.55
  5. Step 5: Solve for x
    x = 8,123.55/73.92
  6. Step 6: Final answer
    x = 109.90

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.