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Finding the Fourth Proportional to 99.29, 136.81 and 84.49

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Solution

The fourth proportional to 99.29, 136.81 and 84.49 is: 116.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.29 : 136.81 = 84.49 : x
  2. Step 2: Convert to fraction form
    99.29/136.81 = 84.49/x
  3. Step 3: Cross multiply
    99.29x = 136.81 × 84.49
  4. Step 4: Simplify right side
    99.29x = 11,559.08
  5. Step 5: Solve for x
    x = 11,559.08/99.29
  6. Step 6: Final answer
    x = 116.42

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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.