Home / 2,231.66-3,079.86-1,287.78

Finding the Fourth Proportional to 2,231.66, 3,079.86 and 1,287.78

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Solution

The fourth proportional to 2,231.66, 3,079.86 and 1,287.78 is: 1,777.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,231.66 : 3,079.86 = 1,287.78 : x
  2. Step 2: Convert to fraction form
    2,231.66/3,079.86 = 1,287.78/x
  3. Step 3: Cross multiply
    2,231.66x = 3,079.86 × 1,287.78
  4. Step 4: Simplify right side
    2,231.66x = 3,966,165.73
  5. Step 5: Solve for x
    x = 3,966,165.73/2,231.66
  6. Step 6: Final answer
    x = 1,777.22

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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.