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Finding the Fourth Proportional to 3,326.97, 4,990.41 and 861.78

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Solution

The fourth proportional to 3,326.97, 4,990.41 and 861.78 is: 1,292.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,326.97 : 4,990.41 = 861.78 : x
  2. Step 2: Convert to fraction form
    3,326.97/4,990.41 = 861.78/x
  3. Step 3: Cross multiply
    3,326.97x = 4,990.41 × 861.78
  4. Step 4: Simplify right side
    3,326.97x = 4,300,635.53
  5. Step 5: Solve for x
    x = 4,300,635.53/3,326.97
  6. Step 6: Final answer
    x = 1,292.66

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1.5x scale

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.