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Finding the Fourth Proportional to 280,819.80, 421,229.70 and 81,146.70

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Solution

The fourth proportional to 280,819.80, 421,229.70 and 81,146.70 is: 121,720.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,819.80 : 421,229.70 = 81,146.70 : x
  2. Step 2: Convert to fraction form
    280,819.80/421,229.70 = 81,146.70/x
  3. Step 3: Cross multiply
    280,819.80x = 421,229.70 × 81,146.70
  4. Step 4: Simplify right side
    280,819.80x = 34,181,400,096.99
  5. Step 5: Solve for x
    x = 34,181,400,096.99/280,819.80
  6. Step 6: Final answer
    x = 121,720.05

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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.