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Finding the Fourth Proportional to 80,704.20, 121,034.70 and 28,108.20

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Solution

The fourth proportional to 80,704.20, 121,034.70 and 28,108.20 is: 42,154.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,704.20 : 121,034.70 = 28,108.20 : x
  2. Step 2: Convert to fraction form
    80,704.20/121,034.70 = 28,108.20/x
  3. Step 3: Cross multiply
    80,704.20x = 121,034.70 × 28,108.20
  4. Step 4: Simplify right side
    80,704.20x = 3,402,067,554.54
  5. Step 5: Solve for x
    x = 3,402,067,554.54/80,704.20
  6. Step 6: Final answer
    x = 42,154.78

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1.5x scale

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.