Home / 1,286.76-1,939.37-1,215.23

Finding the Fourth Proportional to 1,286.76, 1,939.37 and 1,215.23

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Solution

The fourth proportional to 1,286.76, 1,939.37 and 1,215.23 is: 1,831.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.76 : 1,939.37 = 1,215.23 : x
  2. Step 2: Convert to fraction form
    1,286.76/1,939.37 = 1,215.23/x
  3. Step 3: Cross multiply
    1,286.76x = 1,939.37 × 1,215.23
  4. Step 4: Simplify right side
    1,286.76x = 2,356,780.61
  5. Step 5: Solve for x
    x = 2,356,780.61/1,286.76
  6. Step 6: Final answer
    x = 1,831.56

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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.