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Finding the Fourth Proportional to 108.67, 149.93 and 71.79

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Solution

The fourth proportional to 108.67, 149.93 and 71.79 is: 99.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.67 : 149.93 = 71.79 : x
  2. Step 2: Convert to fraction form
    108.67/149.93 = 71.79/x
  3. Step 3: Cross multiply
    108.67x = 149.93 × 71.79
  4. Step 4: Simplify right side
    108.67x = 10,762.62
  5. Step 5: Solve for x
    x = 10,762.62/108.67
  6. Step 6: Final answer
    x = 99.04

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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.