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Finding the Fourth Proportional to 1,000.96, 1,379.80 and 721.78

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Solution

The fourth proportional to 1,000.96, 1,379.80 and 721.78 is: 994.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,000.96 : 1,379.80 = 721.78 : x
  2. Step 2: Convert to fraction form
    1,000.96/1,379.80 = 721.78/x
  3. Step 3: Cross multiply
    1,000.96x = 1,379.80 × 721.78
  4. Step 4: Simplify right side
    1,000.96x = 995,912.04
  5. Step 5: Solve for x
    x = 995,912.04/1,000.96
  6. Step 6: Final answer
    x = 994.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.