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Finding the Fourth Proportional to 2,167.42, 3,251.19 and 686.65

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Solution

The fourth proportional to 2,167.42, 3,251.19 and 686.65 is: 1,029.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,167.42 : 3,251.19 = 686.65 : x
  2. Step 2: Convert to fraction form
    2,167.42/3,251.19 = 686.65/x
  3. Step 3: Cross multiply
    2,167.42x = 3,251.19 × 686.65
  4. Step 4: Simplify right side
    2,167.42x = 2,232,429.61
  5. Step 5: Solve for x
    x = 2,232,429.61/2,167.42
  6. Step 6: Final answer
    x = 1,029.99

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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.