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Finding the Fourth Proportional to 97.98, 135.31 and 66.90

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Solution

The fourth proportional to 97.98, 135.31 and 66.90 is: 92.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.98 : 135.31 = 66.90 : x
  2. Step 2: Convert to fraction form
    97.98/135.31 = 66.90/x
  3. Step 3: Cross multiply
    97.98x = 135.31 × 66.90
  4. Step 4: Simplify right side
    97.98x = 9,052.24
  5. Step 5: Solve for x
    x = 9,052.24/97.98
  6. Step 6: Final answer
    x = 92.39

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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.