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Finding the Fourth Proportional to 108.02, 149.20 and 81.76

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Solution

The fourth proportional to 108.02, 149.20 and 81.76 is: 112.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.02 : 149.20 = 81.76 : x
  2. Step 2: Convert to fraction form
    108.02/149.20 = 81.76/x
  3. Step 3: Cross multiply
    108.02x = 149.20 × 81.76
  4. Step 4: Simplify right side
    108.02x = 12,198.59
  5. Step 5: Solve for x
    x = 12,198.59/108.02
  6. Step 6: Final answer
    x = 112.93

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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.