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Finding the Fourth Proportional to 83.68, 126.05 and 71.53

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Solution

The fourth proportional to 83.68, 126.05 and 71.53 is: 107.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.68 : 126.05 = 71.53 : x
  2. Step 2: Convert to fraction form
    83.68/126.05 = 71.53/x
  3. Step 3: Cross multiply
    83.68x = 126.05 × 71.53
  4. Step 4: Simplify right side
    83.68x = 9,016.36
  5. Step 5: Solve for x
    x = 9,016.36/83.68
  6. Step 6: Final answer
    x = 107.75

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.