Home / 2,641.20-3,956.40-1,989.96

Finding the Fourth Proportional to 2,641.20, 3,956.40 and 1,989.96

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Solution

The fourth proportional to 2,641.20, 3,956.40 and 1,989.96 is: 2,980.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,641.20 : 3,956.40 = 1,989.96 : x
  2. Step 2: Convert to fraction form
    2,641.20/3,956.40 = 1,989.96/x
  3. Step 3: Cross multiply
    2,641.20x = 3,956.40 × 1,989.96
  4. Step 4: Simplify right side
    2,641.20x = 7,873,077.74
  5. Step 5: Solve for x
    x = 7,873,077.74/2,641.20
  6. Step 6: Final answer
    x = 2,980.87

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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.