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Finding the Fourth Proportional to 99.14, 136.80 and 66.33

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Solution

The fourth proportional to 99.14, 136.80 and 66.33 is: 91.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.14 : 136.80 = 66.33 : x
  2. Step 2: Convert to fraction form
    99.14/136.80 = 66.33/x
  3. Step 3: Cross multiply
    99.14x = 136.80 × 66.33
  4. Step 4: Simplify right side
    99.14x = 9,073.94
  5. Step 5: Solve for x
    x = 9,073.94/99.14
  6. Step 6: Final answer
    x = 91.53

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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.