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Finding the Fourth Proportional to 381,668.80, 572,721.90 and 145,181.20

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Solution

The fourth proportional to 381,668.80, 572,721.90 and 145,181.20 is: 217,854.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    381,668.80 : 572,721.90 = 145,181.20 : x
  2. Step 2: Convert to fraction form
    381,668.80/572,721.90 = 145,181.20/x
  3. Step 3: Cross multiply
    381,668.80x = 572,721.90 × 145,181.20
  4. Step 4: Simplify right side
    381,668.80x = 83,148,452,708.28
  5. Step 5: Solve for x
    x = 83,148,452,708.28/381,668.80
  6. Step 6: Final answer
    x = 217,854.99

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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.