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Finding the Fourth Proportional to 861.24, 1,292 and 399.48

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Solution

The fourth proportional to 861.24, 1,292 and 399.48 is: 599.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.24 : 1,292 = 399.48 : x
  2. Step 2: Convert to fraction form
    861.24/1,292 = 399.48/x
  3. Step 3: Cross multiply
    861.24x = 1,292 × 399.48
  4. Step 4: Simplify right side
    861.24x = 516,128.16
  5. Step 5: Solve for x
    x = 516,128.16/861.24
  6. Step 6: Final answer
    x = 599.28

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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.