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Finding the Fourth Proportional to 45,819.20, 68,728.80 and 40,980.80

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Solution

The fourth proportional to 45,819.20, 68,728.80 and 40,980.80 is: 61,471.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,819.20 : 68,728.80 = 40,980.80 : x
  2. Step 2: Convert to fraction form
    45,819.20/68,728.80 = 40,980.80/x
  3. Step 3: Cross multiply
    45,819.20x = 68,728.80 × 40,980.80
  4. Step 4: Simplify right side
    45,819.20x = 2,816,561,207.04
  5. Step 5: Solve for x
    x = 2,816,561,207.04/45,819.20
  6. Step 6: Final answer
    x = 61,471.20

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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.