Home / 2,540.20-3,802.20-1,989.40

Finding the Fourth Proportional to 2,540.20, 3,802.20 and 1,989.40

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Solution

The fourth proportional to 2,540.20, 3,802.20 and 1,989.40 is: 2,977.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,540.20 : 3,802.20 = 1,989.40 : x
  2. Step 2: Convert to fraction form
    2,540.20/3,802.20 = 1,989.40/x
  3. Step 3: Cross multiply
    2,540.20x = 3,802.20 × 1,989.40
  4. Step 4: Simplify right side
    2,540.20x = 7,564,096.68
  5. Step 5: Solve for x
    x = 7,564,096.68/2,540.20
  6. Step 6: Final answer
    x = 2,977.76

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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.