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Finding the Fourth Proportional to 99.43, 136.99 and 86.97

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Solution

The fourth proportional to 99.43, 136.99 and 86.97 is: 119.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.43 : 136.99 = 86.97 : x
  2. Step 2: Convert to fraction form
    99.43/136.99 = 86.97/x
  3. Step 3: Cross multiply
    99.43x = 136.99 × 86.97
  4. Step 4: Simplify right side
    99.43x = 11,914.64
  5. Step 5: Solve for x
    x = 11,914.64/99.43
  6. Step 6: Final answer
    x = 119.83

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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.