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Finding the Fourth Proportional to 758, 1,042.80 and 725.60

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Solution

The fourth proportional to 758, 1,042.80 and 725.60 is: 998.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    758 : 1,042.80 = 725.60 : x
  2. Step 2: Convert to fraction form
    758/1,042.80 = 725.60/x
  3. Step 3: Cross multiply
    758x = 1,042.80 × 725.60
  4. Step 4: Simplify right side
    758x = 756,655.68
  5. Step 5: Solve for x
    x = 756,655.68/758
  6. Step 6: Final answer
    x = 998.23

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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.