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Finding the Fourth Proportional to 2,170.69, 3,255.90 and 871.23

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Solution

The fourth proportional to 2,170.69, 3,255.90 and 871.23 is: 1,306.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,170.69 : 3,255.90 = 871.23 : x
  2. Step 2: Convert to fraction form
    2,170.69/3,255.90 = 871.23/x
  3. Step 3: Cross multiply
    2,170.69x = 3,255.90 × 871.23
  4. Step 4: Simplify right side
    2,170.69x = 2,836,637.76
  5. Step 5: Solve for x
    x = 2,836,637.76/2,170.69
  6. Step 6: Final answer
    x = 1,306.79

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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.