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Finding the Fourth Proportional to 108.15, 149.25 and 66.71

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Solution

The fourth proportional to 108.15, 149.25 and 66.71 is: 92.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.15 : 149.25 = 66.71 : x
  2. Step 2: Convert to fraction form
    108.15/149.25 = 66.71/x
  3. Step 3: Cross multiply
    108.15x = 149.25 × 66.71
  4. Step 4: Simplify right side
    108.15x = 9,956.28
  5. Step 5: Solve for x
    x = 9,956.28/108.15
  6. Step 6: Final answer
    x = 92.06

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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.