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Finding the Fourth Proportional to 84.20, 115.92 and 73.76

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Solution

The fourth proportional to 84.20, 115.92 and 73.76 is: 101.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.20 : 115.92 = 73.76 : x
  2. Step 2: Convert to fraction form
    84.20/115.92 = 73.76/x
  3. Step 3: Cross multiply
    84.20x = 115.92 × 73.76
  4. Step 4: Simplify right side
    84.20x = 8,550.26
  5. Step 5: Solve for x
    x = 8,550.26/84.20
  6. Step 6: Final answer
    x = 101.55

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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.