Home / 2,787.20-4,180.80-1,143.20

Finding the Fourth Proportional to 2,787.20, 4,180.80 and 1,143.20

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Solution

The fourth proportional to 2,787.20, 4,180.80 and 1,143.20 is: 1,714.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,787.20 : 4,180.80 = 1,143.20 : x
  2. Step 2: Convert to fraction form
    2,787.20/4,180.80 = 1,143.20/x
  3. Step 3: Cross multiply
    2,787.20x = 4,180.80 × 1,143.20
  4. Step 4: Simplify right side
    2,787.20x = 4,779,490.56
  5. Step 5: Solve for x
    x = 4,779,490.56/2,787.20
  6. Step 6: Final answer
    x = 1,714.80

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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.