Home / 1,242.28-1,872.52-1,138.38

Finding the Fourth Proportional to 1,242.28, 1,872.52 and 1,138.38

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Solution

The fourth proportional to 1,242.28, 1,872.52 and 1,138.38 is: 1,715.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.28 : 1,872.52 = 1,138.38 : x
  2. Step 2: Convert to fraction form
    1,242.28/1,872.52 = 1,138.38/x
  3. Step 3: Cross multiply
    1,242.28x = 1,872.52 × 1,138.38
  4. Step 4: Simplify right side
    1,242.28x = 2,131,639.32
  5. Step 5: Solve for x
    x = 2,131,639.32/1,242.28
  6. Step 6: Final answer
    x = 1,715.91

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.