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Finding the Fourth Proportional to 80,501.61, 120,839.90 and 68,079.45

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Solution

The fourth proportional to 80,501.61, 120,839.90 and 68,079.45 is: 102,193.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,501.61 : 120,839.90 = 68,079.45 : x
  2. Step 2: Convert to fraction form
    80,501.61/120,839.90 = 68,079.45/x
  3. Step 3: Cross multiply
    80,501.61x = 120,839.90 × 68,079.45
  4. Step 4: Simplify right side
    80,501.61x = 8,226,713,589.66
  5. Step 5: Solve for x
    x = 8,226,713,589.66/80,501.61
  6. Step 6: Final answer
    x = 102,193.16

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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.