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Finding the Fourth Proportional to 808.20, 1,112.58 and 725.28

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Solution

The fourth proportional to 808.20, 1,112.58 and 725.28 is: 998.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.20 : 1,112.58 = 725.28 : x
  2. Step 2: Convert to fraction form
    808.20/1,112.58 = 725.28/x
  3. Step 3: Cross multiply
    808.20x = 1,112.58 × 725.28
  4. Step 4: Simplify right side
    808.20x = 806,932.02
  5. Step 5: Solve for x
    x = 806,932.02/808.20
  6. Step 6: Final answer
    x = 998.43

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.