Home / 1,278.68-1,909.37-1,121.34

Finding the Fourth Proportional to 1,278.68, 1,909.37 and 1,121.34

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Solution

The fourth proportional to 1,278.68, 1,909.37 and 1,121.34 is: 1,674.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.68 : 1,909.37 = 1,121.34 : x
  2. Step 2: Convert to fraction form
    1,278.68/1,909.37 = 1,121.34/x
  3. Step 3: Cross multiply
    1,278.68x = 1,909.37 × 1,121.34
  4. Step 4: Simplify right side
    1,278.68x = 2,141,052.96
  5. Step 5: Solve for x
    x = 2,141,052.96/1,278.68
  6. Step 6: Final answer
    x = 1,674.42

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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.