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Finding the Fourth Proportional to 381,639.60, 572,743.80 and 145,443.60

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Solution

The fourth proportional to 381,639.60, 572,743.80 and 145,443.60 is: 218,273.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    381,639.60 : 572,743.80 = 145,443.60 : x
  2. Step 2: Convert to fraction form
    381,639.60/572,743.80 = 145,443.60/x
  3. Step 3: Cross multiply
    381,639.60x = 572,743.80 × 145,443.60
  4. Step 4: Simplify right side
    381,639.60x = 83,301,920,149.68
  5. Step 5: Solve for x
    x = 83,301,920,149.68/381,639.60
  6. Step 6: Final answer
    x = 218,273.79

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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.