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Finding the Fourth Proportional to 836.08, 1,255.38 and 721.42

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Solution

The fourth proportional to 836.08, 1,255.38 and 721.42 is: 1,083.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    836.08 : 1,255.38 = 721.42 : x
  2. Step 2: Convert to fraction form
    836.08/1,255.38 = 721.42/x
  3. Step 3: Cross multiply
    836.08x = 1,255.38 × 721.42
  4. Step 4: Simplify right side
    836.08x = 905,656.24
  5. Step 5: Solve for x
    x = 905,656.24/836.08
  6. Step 6: Final answer
    x = 1,083.22

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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.