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Finding the Fourth Proportional to 2,169.61, 3,254.31 and 708.57

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Solution

The fourth proportional to 2,169.61, 3,254.31 and 708.57 is: 1,062.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,169.61 : 3,254.31 = 708.57 : x
  2. Step 2: Convert to fraction form
    2,169.61/3,254.31 = 708.57/x
  3. Step 3: Cross multiply
    2,169.61x = 3,254.31 × 708.57
  4. Step 4: Simplify right side
    2,169.61x = 2,305,906.44
  5. Step 5: Solve for x
    x = 2,305,906.44/2,169.61
  6. Step 6: Final answer
    x = 1,062.82

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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.