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Finding the Fourth Proportional to 755.43, 1,042.07 and 519.35

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Solution

The fourth proportional to 755.43, 1,042.07 and 519.35 is: 716.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.43 : 1,042.07 = 519.35 : x
  2. Step 2: Convert to fraction form
    755.43/1,042.07 = 519.35/x
  3. Step 3: Cross multiply
    755.43x = 1,042.07 × 519.35
  4. Step 4: Simplify right side
    755.43x = 541,191.25
  5. Step 5: Solve for x
    x = 541,191.25/755.43
  6. Step 6: Final answer
    x = 716.41

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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.