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Finding the Fourth Proportional to 108.80, 150.12 and 91.38

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Solution

The fourth proportional to 108.80, 150.12 and 91.38 is: 126.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.80 : 150.12 = 91.38 : x
  2. Step 2: Convert to fraction form
    108.80/150.12 = 91.38/x
  3. Step 3: Cross multiply
    108.80x = 150.12 × 91.38
  4. Step 4: Simplify right side
    108.80x = 13,717.97
  5. Step 5: Solve for x
    x = 13,717.97/108.80
  6. Step 6: Final answer
    x = 126.08

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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.