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Finding the Fourth Proportional to 381,705.80, 572,069.10 and 213,225.80

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Solution

The fourth proportional to 381,705.80, 572,069.10 and 213,225.80 is: 319,565.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    381,705.80 : 572,069.10 = 213,225.80 : x
  2. Step 2: Convert to fraction form
    381,705.80/572,069.10 = 213,225.80/x
  3. Step 3: Cross multiply
    381,705.80x = 572,069.10 × 213,225.80
  4. Step 4: Simplify right side
    381,705.80x = 121,979,891,502.78
  5. Step 5: Solve for x
    x = 121,979,891,502.78/381,705.80
  6. Step 6: Final answer
    x = 319,565.20

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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.