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Finding the Fourth Proportional to 99.39, 136.95 and 71.72

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Solution

The fourth proportional to 99.39, 136.95 and 71.72 is: 98.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.39 : 136.95 = 71.72 : x
  2. Step 2: Convert to fraction form
    99.39/136.95 = 71.72/x
  3. Step 3: Cross multiply
    99.39x = 136.95 × 71.72
  4. Step 4: Simplify right side
    99.39x = 9,822.05
  5. Step 5: Solve for x
    x = 9,822.05/99.39
  6. Step 6: Final answer
    x = 98.82

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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.