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Finding the Fourth Proportional to 2,169.90, 3,255.16 and 708.74

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Solution

The fourth proportional to 2,169.90, 3,255.16 and 708.74 is: 1,063.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,169.90 : 3,255.16 = 708.74 : x
  2. Step 2: Convert to fraction form
    2,169.90/3,255.16 = 708.74/x
  3. Step 3: Cross multiply
    2,169.90x = 3,255.16 × 708.74
  4. Step 4: Simplify right side
    2,169.90x = 2,307,062.10
  5. Step 5: Solve for x
    x = 2,307,062.10/2,169.90
  6. Step 6: Final answer
    x = 1,063.21

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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.