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Finding the Fourth Proportional to 574.50, 861.21 and 543.72

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Solution

The fourth proportional to 574.50, 861.21 and 543.72 is: 815.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    574.50 : 861.21 = 543.72 : x
  2. Step 2: Convert to fraction form
    574.50/861.21 = 543.72/x
  3. Step 3: Cross multiply
    574.50x = 861.21 × 543.72
  4. Step 4: Simplify right side
    574.50x = 468,257.10
  5. Step 5: Solve for x
    x = 468,257.10/574.50
  6. Step 6: Final answer
    x = 815.07

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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.