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Finding the Fourth Proportional to 872.20, 1,314.29 and 721.52

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Solution

The fourth proportional to 872.20, 1,314.29 and 721.52 is: 1,087.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.20 : 1,314.29 = 721.52 : x
  2. Step 2: Convert to fraction form
    872.20/1,314.29 = 721.52/x
  3. Step 3: Cross multiply
    872.20x = 1,314.29 × 721.52
  4. Step 4: Simplify right side
    872.20x = 948,276.34
  5. Step 5: Solve for x
    x = 948,276.34/872.20
  6. Step 6: Final answer
    x = 1,087.23

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.