Home / 1,861.80-2,787.57-1,129.56

Finding the Fourth Proportional to 1,861.80, 2,787.57 and 1,129.56

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Solution

The fourth proportional to 1,861.80, 2,787.57 and 1,129.56 is: 1,691.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,861.80 : 2,787.57 = 1,129.56 : x
  2. Step 2: Convert to fraction form
    1,861.80/2,787.57 = 1,129.56/x
  3. Step 3: Cross multiply
    1,861.80x = 2,787.57 × 1,129.56
  4. Step 4: Simplify right side
    1,861.80x = 3,148,727.57
  5. Step 5: Solve for x
    x = 3,148,727.57/1,861.80
  6. Step 6: Final answer
    x = 1,691.23

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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.