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Finding the Fourth Proportional to 843.92, 1,256.47 and 831.78

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Solution

The fourth proportional to 843.92, 1,256.47 and 831.78 is: 1,238.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    843.92 : 1,256.47 = 831.78 : x
  2. Step 2: Convert to fraction form
    843.92/1,256.47 = 831.78/x
  3. Step 3: Cross multiply
    843.92x = 1,256.47 × 831.78
  4. Step 4: Simplify right side
    843.92x = 1,045,106.62
  5. Step 5: Solve for x
    x = 1,045,106.62/843.92
  6. Step 6: Final answer
    x = 1,238.40

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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.