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Finding the Fourth Proportional to 844.48, 1,255.64 and 811.68

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Solution

The fourth proportional to 844.48, 1,255.64 and 811.68 is: 1,206.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    844.48 : 1,255.64 = 811.68 : x
  2. Step 2: Convert to fraction form
    844.48/1,255.64 = 811.68/x
  3. Step 3: Cross multiply
    844.48x = 1,255.64 × 811.68
  4. Step 4: Simplify right side
    844.48x = 1,019,177.88
  5. Step 5: Solve for x
    x = 1,019,177.88/844.48
  6. Step 6: Final answer
    x = 1,206.87

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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.