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Finding the Fourth Proportional to 108.39, 149.56 and 66.92

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Solution

The fourth proportional to 108.39, 149.56 and 66.92 is: 92.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.39 : 149.56 = 66.92 : x
  2. Step 2: Convert to fraction form
    108.39/149.56 = 66.92/x
  3. Step 3: Cross multiply
    108.39x = 149.56 × 66.92
  4. Step 4: Simplify right side
    108.39x = 10,009.10
  5. Step 5: Solve for x
    x = 10,009.10/108.39
  6. Step 6: Final answer
    x = 92.35

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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.