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Finding the Fourth Proportional to 2,086.20, 3,129.71 and 625.23

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Solution

The fourth proportional to 2,086.20, 3,129.71 and 625.23 is: 937.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,086.20 : 3,129.71 = 625.23 : x
  2. Step 2: Convert to fraction form
    2,086.20/3,129.71 = 625.23/x
  3. Step 3: Cross multiply
    2,086.20x = 3,129.71 × 625.23
  4. Step 4: Simplify right side
    2,086.20x = 1,956,785.46
  5. Step 5: Solve for x
    x = 1,956,785.46/2,086.20
  6. Step 6: Final answer
    x = 937.97

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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.