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Finding the Fourth Proportional to 99.20, 136.86 and 79.53

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Solution

The fourth proportional to 99.20, 136.86 and 79.53 is: 109.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.20 : 136.86 = 79.53 : x
  2. Step 2: Convert to fraction form
    99.20/136.86 = 79.53/x
  3. Step 3: Cross multiply
    99.20x = 136.86 × 79.53
  4. Step 4: Simplify right side
    99.20x = 10,884.48
  5. Step 5: Solve for x
    x = 10,884.48/99.20
  6. Step 6: Final answer
    x = 109.73

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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.