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Finding the Fourth Proportional to 99.52, 149.04 and 81.28

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Solution

The fourth proportional to 99.52, 149.04 and 81.28 is: 121.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.52 : 149.04 = 81.28 : x
  2. Step 2: Convert to fraction form
    99.52/149.04 = 81.28/x
  3. Step 3: Cross multiply
    99.52x = 149.04 × 81.28
  4. Step 4: Simplify right side
    99.52x = 12,113.97
  5. Step 5: Solve for x
    x = 12,113.97/99.52
  6. Step 6: Final answer
    x = 121.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.