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Finding the Fourth Proportional to 755.11, 1,131.31 and 572.59

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Solution

The fourth proportional to 755.11, 1,131.31 and 572.59 is: 857.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.11 : 1,131.31 = 572.59 : x
  2. Step 2: Convert to fraction form
    755.11/1,131.31 = 572.59/x
  3. Step 3: Cross multiply
    755.11x = 1,131.31 × 572.59
  4. Step 4: Simplify right side
    755.11x = 647,768.27
  5. Step 5: Solve for x
    x = 647,768.27/755.11
  6. Step 6: Final answer
    x = 857.85

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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.