Home / 1,288.68-1,778.52-1,067.28

Finding the Fourth Proportional to 1,288.68, 1,778.52 and 1,067.28

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Solution

The fourth proportional to 1,288.68, 1,778.52 and 1,067.28 is: 1,472.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.68 : 1,778.52 = 1,067.28 : x
  2. Step 2: Convert to fraction form
    1,288.68/1,778.52 = 1,067.28/x
  3. Step 3: Cross multiply
    1,288.68x = 1,778.52 × 1,067.28
  4. Step 4: Simplify right side
    1,288.68x = 1,898,178.83
  5. Step 5: Solve for x
    x = 1,898,178.83/1,288.68
  6. Step 6: Final answer
    x = 1,472.96

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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.