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Finding the Fourth Proportional to 1,220.44, 1,831.46 and 1,139.44

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Solution

The fourth proportional to 1,220.44, 1,831.46 and 1,139.44 is: 1,709.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.44 : 1,831.46 = 1,139.44 : x
  2. Step 2: Convert to fraction form
    1,220.44/1,831.46 = 1,139.44/x
  3. Step 3: Cross multiply
    1,220.44x = 1,831.46 × 1,139.44
  4. Step 4: Simplify right side
    1,220.44x = 2,086,838.78
  5. Step 5: Solve for x
    x = 2,086,838.78/1,220.44
  6. Step 6: Final answer
    x = 1,709.91

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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.