Home / 1,286.28-1,930.86-1,238.76

Finding the Fourth Proportional to 1,286.28, 1,930.86 and 1,238.76

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Solution

The fourth proportional to 1,286.28, 1,930.86 and 1,238.76 is: 1,859.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.28 : 1,930.86 = 1,238.76 : x
  2. Step 2: Convert to fraction form
    1,286.28/1,930.86 = 1,238.76/x
  3. Step 3: Cross multiply
    1,286.28x = 1,930.86 × 1,238.76
  4. Step 4: Simplify right side
    1,286.28x = 2,391,872.13
  5. Step 5: Solve for x
    x = 2,391,872.13/1,286.28
  6. Step 6: Final answer
    x = 1,859.53

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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.