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Finding the Fourth Proportional to 2,766.61, 4,149.85 and 686.62

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Solution

The fourth proportional to 2,766.61, 4,149.85 and 686.62 is: 1,029.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,766.61 : 4,149.85 = 686.62 : x
  2. Step 2: Convert to fraction form
    2,766.61/4,149.85 = 686.62/x
  3. Step 3: Cross multiply
    2,766.61x = 4,149.85 × 686.62
  4. Step 4: Simplify right side
    2,766.61x = 2,849,370.01
  5. Step 5: Solve for x
    x = 2,849,370.01/2,766.61
  6. Step 6: Final answer
    x = 1,029.91

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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.