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Finding the Fourth Proportional to 108.62, 149.88 and 91.07

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Solution

The fourth proportional to 108.62, 149.88 and 91.07 is: 125.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.62 : 149.88 = 91.07 : x
  2. Step 2: Convert to fraction form
    108.62/149.88 = 91.07/x
  3. Step 3: Cross multiply
    108.62x = 149.88 × 91.07
  4. Step 4: Simplify right side
    108.62x = 13,649.57
  5. Step 5: Solve for x
    x = 13,649.57/108.62
  6. Step 6: Final answer
    x = 125.66

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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.