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Finding the Fourth Proportional to 82,721.70, 124,082.55 and 74,427.30

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Solution

The fourth proportional to 82,721.70, 124,082.55 and 74,427.30 is: 111,640.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,721.70 : 124,082.55 = 74,427.30 : x
  2. Step 2: Convert to fraction form
    82,721.70/124,082.55 = 74,427.30/x
  3. Step 3: Cross multiply
    82,721.70x = 124,082.55 × 74,427.30
  4. Step 4: Simplify right side
    82,721.70x = 9,235,129,173.62
  5. Step 5: Solve for x
    x = 9,235,129,173.62/82,721.70
  6. Step 6: Final answer
    x = 111,640.95

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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.