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Finding the Fourth Proportional to 108.71, 149.75 and 84.11

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Solution

The fourth proportional to 108.71, 149.75 and 84.11 is: 115.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.71 : 149.75 = 84.11 : x
  2. Step 2: Convert to fraction form
    108.71/149.75 = 84.11/x
  3. Step 3: Cross multiply
    108.71x = 149.75 × 84.11
  4. Step 4: Simplify right side
    108.71x = 12,594.62
  5. Step 5: Solve for x
    x = 12,594.62/108.71
  6. Step 6: Final answer
    x = 115.86

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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.