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Finding the Fourth Proportional to 83.42, 115.22 and 69.65

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Solution

The fourth proportional to 83.42, 115.22 and 69.65 is: 96.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.42 : 115.22 = 69.65 : x
  2. Step 2: Convert to fraction form
    83.42/115.22 = 69.65/x
  3. Step 3: Cross multiply
    83.42x = 115.22 × 69.65
  4. Step 4: Simplify right side
    83.42x = 8,024.67
  5. Step 5: Solve for x
    x = 8,024.67/83.42
  6. Step 6: Final answer
    x = 96.20

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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.