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Finding the Fourth Proportional to 108.70, 149.92 and 73.72

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Solution

The fourth proportional to 108.70, 149.92 and 73.72 is: 101.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.70 : 149.92 = 73.72 : x
  2. Step 2: Convert to fraction form
    108.70/149.92 = 73.72/x
  3. Step 3: Cross multiply
    108.70x = 149.92 × 73.72
  4. Step 4: Simplify right side
    108.70x = 11,052.10
  5. Step 5: Solve for x
    x = 11,052.10/108.70
  6. Step 6: Final answer
    x = 101.68

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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.