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Finding the Fourth Proportional to 381,621.60, 572,716.80 and 145,425.60

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Solution

The fourth proportional to 381,621.60, 572,716.80 and 145,425.60 is: 218,246.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    381,621.60 : 572,716.80 = 145,425.60 : x
  2. Step 2: Convert to fraction form
    381,621.60/572,716.80 = 145,425.60/x
  3. Step 3: Cross multiply
    381,621.60x = 572,716.80 × 145,425.60
  4. Step 4: Simplify right side
    381,621.60x = 83,287,684,270.08
  5. Step 5: Solve for x
    x = 83,287,684,270.08/381,621.60
  6. Step 6: Final answer
    x = 218,246.78

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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.