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Finding the Fourth Proportional to 574.56, 861.80 and 209.28

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Solution

The fourth proportional to 574.56, 861.80 and 209.28 is: 313.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    574.56 : 861.80 = 209.28 : x
  2. Step 2: Convert to fraction form
    574.56/861.80 = 209.28/x
  3. Step 3: Cross multiply
    574.56x = 861.80 × 209.28
  4. Step 4: Simplify right side
    574.56x = 180,357.50
  5. Step 5: Solve for x
    x = 180,357.50/574.56
  6. Step 6: Final answer
    x = 313.91

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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.