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Finding the Fourth Proportional to 82.62, 123.84 and 69.12

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Solution

The fourth proportional to 82.62, 123.84 and 69.12 is: 103.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.62 : 123.84 = 69.12 : x
  2. Step 2: Convert to fraction form
    82.62/123.84 = 69.12/x
  3. Step 3: Cross multiply
    82.62x = 123.84 × 69.12
  4. Step 4: Simplify right side
    82.62x = 8,559.82
  5. Step 5: Solve for x
    x = 8,559.82/82.62
  6. Step 6: Final answer
    x = 103.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.