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Finding the Fourth Proportional to 755.30, 1,040.16 and 679.97

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Solution

The fourth proportional to 755.30, 1,040.16 and 679.97 is: 936.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.30 : 1,040.16 = 679.97 : x
  2. Step 2: Convert to fraction form
    755.30/1,040.16 = 679.97/x
  3. Step 3: Cross multiply
    755.30x = 1,040.16 × 679.97
  4. Step 4: Simplify right side
    755.30x = 707,278.92
  5. Step 5: Solve for x
    x = 707,278.92/755.30
  6. Step 6: Final answer
    x = 936.42

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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.