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Finding the Fourth Proportional to 574.34, 861.71 and 209.15

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Solution

The fourth proportional to 574.34, 861.71 and 209.15 is: 313.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    574.34 : 861.71 = 209.15 : x
  2. Step 2: Convert to fraction form
    574.34/861.71 = 209.15/x
  3. Step 3: Cross multiply
    574.34x = 861.71 × 209.15
  4. Step 4: Simplify right side
    574.34x = 180,221.29
  5. Step 5: Solve for x
    x = 180,221.29/574.34
  6. Step 6: Final answer
    x = 313.79

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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.