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Finding the Fourth Proportional to 108.18, 149.31 and 79.11

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Solution

The fourth proportional to 108.18, 149.31 and 79.11 is: 109.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.18 : 149.31 = 79.11 : x
  2. Step 2: Convert to fraction form
    108.18/149.31 = 79.11/x
  3. Step 3: Cross multiply
    108.18x = 149.31 × 79.11
  4. Step 4: Simplify right side
    108.18x = 11,811.91
  5. Step 5: Solve for x
    x = 11,811.91/108.18
  6. Step 6: Final answer
    x = 109.19

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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.