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Finding the Fourth Proportional to 574.12, 861.90 and 285.40

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Solution

The fourth proportional to 574.12, 861.90 and 285.40 is: 428.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    574.12 : 861.90 = 285.40 : x
  2. Step 2: Convert to fraction form
    574.12/861.90 = 285.40/x
  3. Step 3: Cross multiply
    574.12x = 861.90 × 285.40
  4. Step 4: Simplify right side
    574.12x = 245,986.26
  5. Step 5: Solve for x
    x = 245,986.26/574.12
  6. Step 6: Final answer
    x = 428.46

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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.