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Finding the Fourth Proportional to 574.60, 861.20 and 285.42

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Solution

The fourth proportional to 574.60, 861.20 and 285.42 is: 427.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    574.60 : 861.20 = 285.42 : x
  2. Step 2: Convert to fraction form
    574.60/861.20 = 285.42/x
  3. Step 3: Cross multiply
    574.60x = 861.20 × 285.42
  4. Step 4: Simplify right side
    574.60x = 245,803.70
  5. Step 5: Solve for x
    x = 245,803.70/574.60
  6. Step 6: Final answer
    x = 427.78

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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.