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Finding the Fourth Proportional to 1,279.70, 1,765.70 and 748.44

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Solution

The fourth proportional to 1,279.70, 1,765.70 and 748.44 is: 1,032.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.70 : 1,765.70 = 748.44 : x
  2. Step 2: Convert to fraction form
    1,279.70/1,765.70 = 748.44/x
  3. Step 3: Cross multiply
    1,279.70x = 1,765.70 × 748.44
  4. Step 4: Simplify right side
    1,279.70x = 1,321,519.57
  5. Step 5: Solve for x
    x = 1,321,519.57/1,279.70
  6. Step 6: Final answer
    x = 1,032.68

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1.5x scale

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.