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Finding the Fourth Proportional to 83.99, 115.89 and 57.71

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Solution

The fourth proportional to 83.99, 115.89 and 57.71 is: 79.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.99 : 115.89 = 57.71 : x
  2. Step 2: Convert to fraction form
    83.99/115.89 = 57.71/x
  3. Step 3: Cross multiply
    83.99x = 115.89 × 57.71
  4. Step 4: Simplify right side
    83.99x = 6,687.43
  5. Step 5: Solve for x
    x = 6,687.43/83.99
  6. Step 6: Final answer
    x = 79.63

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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.