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Finding the Fourth Proportional to 98.80, 135.92 and 94.32

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Solution

The fourth proportional to 98.80, 135.92 and 94.32 is: 129.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.80 : 135.92 = 94.32 : x
  2. Step 2: Convert to fraction form
    98.80/135.92 = 94.32/x
  3. Step 3: Cross multiply
    98.80x = 135.92 × 94.32
  4. Step 4: Simplify right side
    98.80x = 12,819.97
  5. Step 5: Solve for x
    x = 12,819.97/98.80
  6. Step 6: Final answer
    x = 129.76

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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.