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Finding the Fourth Proportional to 79,909.80, 120,156.30 and 67,079.40

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Solution

The fourth proportional to 79,909.80, 120,156.30 and 67,079.40 is: 100,863.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,909.80 : 120,156.30 = 67,079.40 : x
  2. Step 2: Convert to fraction form
    79,909.80/120,156.30 = 67,079.40/x
  3. Step 3: Cross multiply
    79,909.80x = 120,156.30 × 67,079.40
  4. Step 4: Simplify right side
    79,909.80x = 8,060,012,510.22
  5. Step 5: Solve for x
    x = 8,060,012,510.22/79,909.80
  6. Step 6: Final answer
    x = 100,863.88

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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.