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Finding the Fourth Proportional to 574.11, 861.62 and 388.80

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Solution

The fourth proportional to 574.11, 861.62 and 388.80 is: 583.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    574.11 : 861.62 = 388.80 : x
  2. Step 2: Convert to fraction form
    574.11/861.62 = 388.80/x
  3. Step 3: Cross multiply
    574.11x = 861.62 × 388.80
  4. Step 4: Simplify right side
    574.11x = 334,995.91
  5. Step 5: Solve for x
    x = 334,995.91/574.11
  6. Step 6: Final answer
    x = 583.50

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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.