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Finding the Fourth Proportional to 1,279.20, 1,765.50 and 755.13

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Solution

The fourth proportional to 1,279.20, 1,765.50 and 755.13 is: 1,042.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.20 : 1,765.50 = 755.13 : x
  2. Step 2: Convert to fraction form
    1,279.20/1,765.50 = 755.13/x
  3. Step 3: Cross multiply
    1,279.20x = 1,765.50 × 755.13
  4. Step 4: Simplify right side
    1,279.20x = 1,333,182.02
  5. Step 5: Solve for x
    x = 1,333,182.02/1,279.20
  6. Step 6: Final answer
    x = 1,042.20

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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.