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Finding the Fourth Proportional to 83.16, 115.09 and 71.54

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Solution

The fourth proportional to 83.16, 115.09 and 71.54 is: 99.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.16 : 115.09 = 71.54 : x
  2. Step 2: Convert to fraction form
    83.16/115.09 = 71.54/x
  3. Step 3: Cross multiply
    83.16x = 115.09 × 71.54
  4. Step 4: Simplify right side
    83.16x = 8,233.92
  5. Step 5: Solve for x
    x = 8,233.92/83.16
  6. Step 6: Final answer
    x = 99.01

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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.