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Finding the Fourth Proportional to 79,915.80, 120,165.30 and 67,085.40

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Solution

The fourth proportional to 79,915.80, 120,165.30 and 67,085.40 is: 100,872.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,915.80 : 120,165.30 = 67,085.40 : x
  2. Step 2: Convert to fraction form
    79,915.80/120,165.30 = 67,085.40/x
  3. Step 3: Cross multiply
    79,915.80x = 120,165.30 × 67,085.40
  4. Step 4: Simplify right side
    79,915.80x = 8,061,337,216.62
  5. Step 5: Solve for x
    x = 8,061,337,216.62/79,915.80
  6. Step 6: Final answer
    x = 100,872.88

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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.