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Finding the Fourth Proportional to 1,279.26, 1,917.96 and 693.90

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Solution

The fourth proportional to 1,279.26, 1,917.96 and 693.90 is: 1,040.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.26 : 1,917.96 = 693.90 : x
  2. Step 2: Convert to fraction form
    1,279.26/1,917.96 = 693.90/x
  3. Step 3: Cross multiply
    1,279.26x = 1,917.96 × 693.90
  4. Step 4: Simplify right side
    1,279.26x = 1,330,872.44
  5. Step 5: Solve for x
    x = 1,330,872.44/1,279.26
  6. Step 6: Final answer
    x = 1,040.35

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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.