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Finding the Fourth Proportional to 818.38, 1,221.16 and 719.97

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Solution

The fourth proportional to 818.38, 1,221.16 and 719.97 is: 1,074.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.38 : 1,221.16 = 719.97 : x
  2. Step 2: Convert to fraction form
    818.38/1,221.16 = 719.97/x
  3. Step 3: Cross multiply
    818.38x = 1,221.16 × 719.97
  4. Step 4: Simplify right side
    818.38x = 879,198.57
  5. Step 5: Solve for x
    x = 879,198.57/818.38
  6. Step 6: Final answer
    x = 1,074.32

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.