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Finding the Fourth Proportional to 108.13, 149.08 and 71.28

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Solution

The fourth proportional to 108.13, 149.08 and 71.28 is: 98.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.13 : 149.08 = 71.28 : x
  2. Step 2: Convert to fraction form
    108.13/149.08 = 71.28/x
  3. Step 3: Cross multiply
    108.13x = 149.08 × 71.28
  4. Step 4: Simplify right side
    108.13x = 10,626.42
  5. Step 5: Solve for x
    x = 10,626.42/108.13
  6. Step 6: Final answer
    x = 98.27

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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.