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Finding the Fourth Proportional to 82.70, 124.65 and 77.12

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Solution

The fourth proportional to 82.70, 124.65 and 77.12 is: 116.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.70 : 124.65 = 77.12 : x
  2. Step 2: Convert to fraction form
    82.70/124.65 = 77.12/x
  3. Step 3: Cross multiply
    82.70x = 124.65 × 77.12
  4. Step 4: Simplify right side
    82.70x = 9,612.85
  5. Step 5: Solve for x
    x = 9,612.85/82.70
  6. Step 6: Final answer
    x = 116.24

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.