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Finding the Fourth Proportional to 2,170.86, 3,255.39 and 871.98

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Solution

The fourth proportional to 2,170.86, 3,255.39 and 871.98 is: 1,307.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,170.86 : 3,255.39 = 871.98 : x
  2. Step 2: Convert to fraction form
    2,170.86/3,255.39 = 871.98/x
  3. Step 3: Cross multiply
    2,170.86x = 3,255.39 × 871.98
  4. Step 4: Simplify right side
    2,170.86x = 2,838,634.97
  5. Step 5: Solve for x
    x = 2,838,634.97/2,170.86
  6. Step 6: Final answer
    x = 1,307.61

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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.