Home / 2,543.40-3,809.70-1,387.80

Finding the Fourth Proportional to 2,543.40, 3,809.70 and 1,387.80

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Solution

The fourth proportional to 2,543.40, 3,809.70 and 1,387.80 is: 2,078.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,543.40 : 3,809.70 = 1,387.80 : x
  2. Step 2: Convert to fraction form
    2,543.40/3,809.70 = 1,387.80/x
  3. Step 3: Cross multiply
    2,543.40x = 3,809.70 × 1,387.80
  4. Step 4: Simplify right side
    2,543.40x = 5,287,101.66
  5. Step 5: Solve for x
    x = 5,287,101.66/2,543.40
  6. Step 6: Final answer
    x = 2,078.75

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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.