Home / 2,879.20-4,318.40-931.68

Finding the Fourth Proportional to 2,879.20, 4,318.40 and 931.68

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Solution

The fourth proportional to 2,879.20, 4,318.40 and 931.68 is: 1,397.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,879.20 : 4,318.40 = 931.68 : x
  2. Step 2: Convert to fraction form
    2,879.20/4,318.40 = 931.68/x
  3. Step 3: Cross multiply
    2,879.20x = 4,318.40 × 931.68
  4. Step 4: Simplify right side
    2,879.20x = 4,023,366.91
  5. Step 5: Solve for x
    x = 4,023,366.91/2,879.20
  6. Step 6: Final answer
    x = 1,397.39

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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.