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Finding the Fourth Proportional to 2,572.86, 3,859.30 and 724.18

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Solution

The fourth proportional to 2,572.86, 3,859.30 and 724.18 is: 1,086.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,572.86 : 3,859.30 = 724.18 : x
  2. Step 2: Convert to fraction form
    2,572.86/3,859.30 = 724.18/x
  3. Step 3: Cross multiply
    2,572.86x = 3,859.30 × 724.18
  4. Step 4: Simplify right side
    2,572.86x = 2,794,827.87
  5. Step 5: Solve for x
    x = 2,794,827.87/2,572.86
  6. Step 6: Final answer
    x = 1,086.27

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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.