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Finding the Fourth Proportional to 78,721.80, 118,082.70 and 48,759.90

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Solution

The fourth proportional to 78,721.80, 118,082.70 and 48,759.90 is: 73,139.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,721.80 : 118,082.70 = 48,759.90 : x
  2. Step 2: Convert to fraction form
    78,721.80/118,082.70 = 48,759.90/x
  3. Step 3: Cross multiply
    78,721.80x = 118,082.70 × 48,759.90
  4. Step 4: Simplify right side
    78,721.80x = 5,757,700,643.73
  5. Step 5: Solve for x
    x = 5,757,700,643.73/78,721.80
  6. Step 6: Final answer
    x = 73,139.85

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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.