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Finding the Fourth Proportional to 82.70, 124.19 and 79.43

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Solution

The fourth proportional to 82.70, 124.19 and 79.43 is: 119.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.70 : 124.19 = 79.43 : x
  2. Step 2: Convert to fraction form
    82.70/124.19 = 79.43/x
  3. Step 3: Cross multiply
    82.70x = 124.19 × 79.43
  4. Step 4: Simplify right side
    82.70x = 9,864.41
  5. Step 5: Solve for x
    x = 9,864.41/82.70
  6. Step 6: Final answer
    x = 119.28

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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.