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Finding the Fourth Proportional to 574.20, 861.30 and 389.40

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Solution

The fourth proportional to 574.20, 861.30 and 389.40 is: 584.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    574.20 : 861.30 = 389.40 : x
  2. Step 2: Convert to fraction form
    574.20/861.30 = 389.40/x
  3. Step 3: Cross multiply
    574.20x = 861.30 × 389.40
  4. Step 4: Simplify right side
    574.20x = 335,390.22
  5. Step 5: Solve for x
    x = 335,390.22/574.20
  6. Step 6: Final answer
    x = 584.10

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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.