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Finding the Fourth Proportional to 381,666.80, 572,010.60 and 213,186.80

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Solution

The fourth proportional to 381,666.80, 572,010.60 and 213,186.80 is: 319,506.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    381,666.80 : 572,010.60 = 213,186.80 : x
  2. Step 2: Convert to fraction form
    381,666.80/572,010.60 = 213,186.80/x
  3. Step 3: Cross multiply
    381,666.80x = 572,010.60 × 213,186.80
  4. Step 4: Simplify right side
    381,666.80x = 121,945,109,380.08
  5. Step 5: Solve for x
    x = 121,945,109,380.08/381,666.80
  6. Step 6: Final answer
    x = 319,506.73

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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.