Home / 1,286.30-1,929.72-1,079.75

Finding the Fourth Proportional to 1,286.30, 1,929.72 and 1,079.75

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Solution

The fourth proportional to 1,286.30, 1,929.72 and 1,079.75 is: 1,619.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.30 : 1,929.72 = 1,079.75 : x
  2. Step 2: Convert to fraction form
    1,286.30/1,929.72 = 1,079.75/x
  3. Step 3: Cross multiply
    1,286.30x = 1,929.72 × 1,079.75
  4. Step 4: Simplify right side
    1,286.30x = 2,083,615.17
  5. Step 5: Solve for x
    x = 2,083,615.17/1,286.30
  6. Step 6: Final answer
    x = 1,619.85

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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.