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Finding the Fourth Proportional to 2,540, 3,810.56 and 1,080.40

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Solution

The fourth proportional to 2,540, 3,810.56 and 1,080.40 is: 1,620.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,540 : 3,810.56 = 1,080.40 : x
  2. Step 2: Convert to fraction form
    2,540/3,810.56 = 1,080.40/x
  3. Step 3: Cross multiply
    2,540x = 3,810.56 × 1,080.40
  4. Step 4: Simplify right side
    2,540x = 4,116,929.02
  5. Step 5: Solve for x
    x = 4,116,929.02/2,540
  6. Step 6: Final answer
    x = 1,620.84

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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.