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Finding the Fourth Proportional to 72,002.20, 108,003.30 and 68,721.70

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Solution

The fourth proportional to 72,002.20, 108,003.30 and 68,721.70 is: 103,082.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,002.20 : 108,003.30 = 68,721.70 : x
  2. Step 2: Convert to fraction form
    72,002.20/108,003.30 = 68,721.70/x
  3. Step 3: Cross multiply
    72,002.20x = 108,003.30 × 68,721.70
  4. Step 4: Simplify right side
    72,002.20x = 7,422,170,381.61
  5. Step 5: Solve for x
    x = 7,422,170,381.61/72,002.20
  6. Step 6: Final answer
    x = 103,082.55

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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.