Home / 1,221.20-1,832.70-759.65

Finding the Fourth Proportional to 1,221.20, 1,832.70 and 759.65

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Solution

The fourth proportional to 1,221.20, 1,832.70 and 759.65 is: 1,140.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.20 : 1,832.70 = 759.65 : x
  2. Step 2: Convert to fraction form
    1,221.20/1,832.70 = 759.65/x
  3. Step 3: Cross multiply
    1,221.20x = 1,832.70 × 759.65
  4. Step 4: Simplify right side
    1,221.20x = 1,392,201.39
  5. Step 5: Solve for x
    x = 1,392,201.39/1,221.20
  6. Step 6: Final answer
    x = 1,140.03

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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.