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Finding the Fourth Proportional to 108.48, 149.64 and 71.61

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Solution

The fourth proportional to 108.48, 149.64 and 71.61 is: 98.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.48 : 149.64 = 71.61 : x
  2. Step 2: Convert to fraction form
    108.48/149.64 = 71.61/x
  3. Step 3: Cross multiply
    108.48x = 149.64 × 71.61
  4. Step 4: Simplify right side
    108.48x = 10,715.72
  5. Step 5: Solve for x
    x = 10,715.72/108.48
  6. Step 6: Final answer
    x = 98.78

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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.