Home / 1,286.28-1,919.90-1,155.06

Finding the Fourth Proportional to 1,286.28, 1,919.90 and 1,155.06

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Solution

The fourth proportional to 1,286.28, 1,919.90 and 1,155.06 is: 1,724.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.28 : 1,919.90 = 1,155.06 : x
  2. Step 2: Convert to fraction form
    1,286.28/1,919.90 = 1,155.06/x
  3. Step 3: Cross multiply
    1,286.28x = 1,919.90 × 1,155.06
  4. Step 4: Simplify right side
    1,286.28x = 2,217,602.58
  5. Step 5: Solve for x
    x = 2,217,602.58/1,286.28
  6. Step 6: Final answer
    x = 1,724.04

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.