Home / 1,780.20-2,456.64-1,081.80

Finding the Fourth Proportional to 1,780.20, 2,456.64 and 1,081.80

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Solution

The fourth proportional to 1,780.20, 2,456.64 and 1,081.80 is: 1,492.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,780.20 : 2,456.64 = 1,081.80 : x
  2. Step 2: Convert to fraction form
    1,780.20/2,456.64 = 1,081.80/x
  3. Step 3: Cross multiply
    1,780.20x = 2,456.64 × 1,081.80
  4. Step 4: Simplify right side
    1,780.20x = 2,657,593.15
  5. Step 5: Solve for x
    x = 2,657,593.15/1,780.20
  6. Step 6: Final answer
    x = 1,492.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.