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Finding the Fourth Proportional to 99.59, 137.12 and 79.85

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Solution

The fourth proportional to 99.59, 137.12 and 79.85 is: 109.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.59 : 137.12 = 79.85 : x
  2. Step 2: Convert to fraction form
    99.59/137.12 = 79.85/x
  3. Step 3: Cross multiply
    99.59x = 137.12 × 79.85
  4. Step 4: Simplify right side
    99.59x = 10,948.98
  5. Step 5: Solve for x
    x = 10,948.98/99.59
  6. Step 6: Final answer
    x = 109.95

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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.