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Finding the Fourth Proportional to 725.28, 1,086.70 and 518.80

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Solution

The fourth proportional to 725.28, 1,086.70 and 518.80 is: 777.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.28 : 1,086.70 = 518.80 : x
  2. Step 2: Convert to fraction form
    725.28/1,086.70 = 518.80/x
  3. Step 3: Cross multiply
    725.28x = 1,086.70 × 518.80
  4. Step 4: Simplify right side
    725.28x = 563,779.96
  5. Step 5: Solve for x
    x = 563,779.96/725.28
  6. Step 6: Final answer
    x = 777.33

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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.