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Finding the Fourth Proportional to 99.35, 136.99 and 80.90

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Solution

The fourth proportional to 99.35, 136.99 and 80.90 is: 111.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.35 : 136.99 = 80.90 : x
  2. Step 2: Convert to fraction form
    99.35/136.99 = 80.90/x
  3. Step 3: Cross multiply
    99.35x = 136.99 × 80.90
  4. Step 4: Simplify right side
    99.35x = 11,082.42
  5. Step 5: Solve for x
    x = 11,082.42/99.35
  6. Step 6: Final answer
    x = 111.55

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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.