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Finding the Fourth Proportional to 808.92, 1,207.12 and 721.55

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Solution

The fourth proportional to 808.92, 1,207.12 and 721.55 is: 1,076.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.92 : 1,207.12 = 721.55 : x
  2. Step 2: Convert to fraction form
    808.92/1,207.12 = 721.55/x
  3. Step 3: Cross multiply
    808.92x = 1,207.12 × 721.55
  4. Step 4: Simplify right side
    808.92x = 870,997.44
  5. Step 5: Solve for x
    x = 870,997.44/808.92
  6. Step 6: Final answer
    x = 1,076.74

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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.