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Finding the Fourth Proportional to 83.99, 115.88 and 62.16

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Solution

The fourth proportional to 83.99, 115.88 and 62.16 is: 85.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.99 : 115.88 = 62.16 : x
  2. Step 2: Convert to fraction form
    83.99/115.88 = 62.16/x
  3. Step 3: Cross multiply
    83.99x = 115.88 × 62.16
  4. Step 4: Simplify right side
    83.99x = 7,202.79
  5. Step 5: Solve for x
    x = 7,202.79/83.99
  6. Step 6: Final answer
    x = 85.76

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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.