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Finding the Fourth Proportional to 1,889.70, 2,831.97 and 792.78

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Solution

The fourth proportional to 1,889.70, 2,831.97 and 792.78 is: 1,188.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,889.70 : 2,831.97 = 792.78 : x
  2. Step 2: Convert to fraction form
    1,889.70/2,831.97 = 792.78/x
  3. Step 3: Cross multiply
    1,889.70x = 2,831.97 × 792.78
  4. Step 4: Simplify right side
    1,889.70x = 2,245,129.18
  5. Step 5: Solve for x
    x = 2,245,129.18/1,889.70
  6. Step 6: Final answer
    x = 1,188.09

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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.