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Finding the Fourth Proportional to 828.34, 1,247.44 and 721.42

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Solution

The fourth proportional to 828.34, 1,247.44 and 721.42 is: 1,086.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.34 : 1,247.44 = 721.42 : x
  2. Step 2: Convert to fraction form
    828.34/1,247.44 = 721.42/x
  3. Step 3: Cross multiply
    828.34x = 1,247.44 × 721.42
  4. Step 4: Simplify right side
    828.34x = 899,928.16
  5. Step 5: Solve for x
    x = 899,928.16/828.34
  6. Step 6: Final answer
    x = 1,086.42

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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.