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Finding the Fourth Proportional to 82.46, 122.85 and 79.56

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Solution

The fourth proportional to 82.46, 122.85 and 79.56 is: 118.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.46 : 122.85 = 79.56 : x
  2. Step 2: Convert to fraction form
    82.46/122.85 = 79.56/x
  3. Step 3: Cross multiply
    82.46x = 122.85 × 79.56
  4. Step 4: Simplify right side
    82.46x = 9,773.95
  5. Step 5: Solve for x
    x = 9,773.95/82.46
  6. Step 6: Final answer
    x = 118.53

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.