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Finding the Fourth Proportional to 716.96, 1,072.20 and 580.88

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Solution

The fourth proportional to 716.96, 1,072.20 and 580.88 is: 868.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.96 : 1,072.20 = 580.88 : x
  2. Step 2: Convert to fraction form
    716.96/1,072.20 = 580.88/x
  3. Step 3: Cross multiply
    716.96x = 1,072.20 × 580.88
  4. Step 4: Simplify right side
    716.96x = 622,819.54
  5. Step 5: Solve for x
    x = 622,819.54/716.96
  6. Step 6: Final answer
    x = 868.69

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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.