Home / 2,540.28-3,810.42-1,385.40

Finding the Fourth Proportional to 2,540.28, 3,810.42 and 1,385.40

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Solution

The fourth proportional to 2,540.28, 3,810.42 and 1,385.40 is: 2,078.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,540.28 : 3,810.42 = 1,385.40 : x
  2. Step 2: Convert to fraction form
    2,540.28/3,810.42 = 1,385.40/x
  3. Step 3: Cross multiply
    2,540.28x = 3,810.42 × 1,385.40
  4. Step 4: Simplify right side
    2,540.28x = 5,278,955.87
  5. Step 5: Solve for x
    x = 5,278,955.87/2,540.28
  6. Step 6: Final answer
    x = 2,078.10

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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.