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Finding the Fourth Proportional to 861.92, 1,292.96 and 573.60

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Solution

The fourth proportional to 861.92, 1,292.96 and 573.60 is: 860.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.92 : 1,292.96 = 573.60 : x
  2. Step 2: Convert to fraction form
    861.92/1,292.96 = 573.60/x
  3. Step 3: Cross multiply
    861.92x = 1,292.96 × 573.60
  4. Step 4: Simplify right side
    861.92x = 741,641.86
  5. Step 5: Solve for x
    x = 741,641.86/861.92
  6. Step 6: Final answer
    x = 860.45

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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.