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Finding the Fourth Proportional to 2,086.85, 3,129.66 and 625.61

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Solution

The fourth proportional to 2,086.85, 3,129.66 and 625.61 is: 938.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,086.85 : 3,129.66 = 625.61 : x
  2. Step 2: Convert to fraction form
    2,086.85/3,129.66 = 625.61/x
  3. Step 3: Cross multiply
    2,086.85x = 3,129.66 × 625.61
  4. Step 4: Simplify right side
    2,086.85x = 1,957,930.94
  5. Step 5: Solve for x
    x = 1,957,930.94/2,086.85
  6. Step 6: Final answer
    x = 938.23

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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.