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Finding the Fourth Proportional to 82.86, 124.13 and 79.81

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Solution

The fourth proportional to 82.86, 124.13 and 79.81 is: 119.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.86 : 124.13 = 79.81 : x
  2. Step 2: Convert to fraction form
    82.86/124.13 = 79.81/x
  3. Step 3: Cross multiply
    82.86x = 124.13 × 79.81
  4. Step 4: Simplify right side
    82.86x = 9,906.42
  5. Step 5: Solve for x
    x = 9,906.42/82.86
  6. Step 6: Final answer
    x = 119.56

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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.