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Finding the Fourth Proportional to 574.65, 861.03 and 391.77

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Solution

The fourth proportional to 574.65, 861.03 and 391.77 is: 587.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    574.65 : 861.03 = 391.77 : x
  2. Step 2: Convert to fraction form
    574.65/861.03 = 391.77/x
  3. Step 3: Cross multiply
    574.65x = 861.03 × 391.77
  4. Step 4: Simplify right side
    574.65x = 337,325.72
  5. Step 5: Solve for x
    x = 337,325.72/574.65
  6. Step 6: Final answer
    x = 587.01

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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.