Home / 1,555.28-2,143.88-1,380.56

Finding the Fourth Proportional to 1,555.28, 2,143.88 and 1,380.56

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Solution

The fourth proportional to 1,555.28, 2,143.88 and 1,380.56 is: 1,903.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,555.28 : 2,143.88 = 1,380.56 : x
  2. Step 2: Convert to fraction form
    1,555.28/2,143.88 = 1,380.56/x
  3. Step 3: Cross multiply
    1,555.28x = 2,143.88 × 1,380.56
  4. Step 4: Simplify right side
    1,555.28x = 2,959,754.97
  5. Step 5: Solve for x
    x = 2,959,754.97/1,555.28
  6. Step 6: Final answer
    x = 1,903.04

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1.5x scale

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.