Home / 2,919.18-4,378.72-727.92

Finding the Fourth Proportional to 2,919.18, 4,378.72 and 727.92

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Solution

The fourth proportional to 2,919.18, 4,378.72 and 727.92 is: 1,091.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,919.18 : 4,378.72 = 727.92 : x
  2. Step 2: Convert to fraction form
    2,919.18/4,378.72 = 727.92/x
  3. Step 3: Cross multiply
    2,919.18x = 4,378.72 × 727.92
  4. Step 4: Simplify right side
    2,919.18x = 3,187,357.86
  5. Step 5: Solve for x
    x = 3,187,357.86/2,919.18
  6. Step 6: Final answer
    x = 1,091.87

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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.