Home / 1,278.62-1,921.60-1,191.96

Finding the Fourth Proportional to 1,278.62, 1,921.60 and 1,191.96

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Solution

The fourth proportional to 1,278.62, 1,921.60 and 1,191.96 is: 1,791.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.62 : 1,921.60 = 1,191.96 : x
  2. Step 2: Convert to fraction form
    1,278.62/1,921.60 = 1,191.96/x
  3. Step 3: Cross multiply
    1,278.62x = 1,921.60 × 1,191.96
  4. Step 4: Simplify right side
    1,278.62x = 2,290,470.34
  5. Step 5: Solve for x
    x = 2,290,470.34/1,278.62
  6. Step 6: Final answer
    x = 1,791.36

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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.