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Finding the Fourth Proportional to 98.97, 136.62 and 66.23

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Solution

The fourth proportional to 98.97, 136.62 and 66.23 is: 91.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.97 : 136.62 = 66.23 : x
  2. Step 2: Convert to fraction form
    98.97/136.62 = 66.23/x
  3. Step 3: Cross multiply
    98.97x = 136.62 × 66.23
  4. Step 4: Simplify right side
    98.97x = 9,048.94
  5. Step 5: Solve for x
    x = 9,048.94/98.97
  6. Step 6: Final answer
    x = 91.43

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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.