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Finding the Fourth Proportional to 1,229.06, 1,839.97 and 811.82

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Solution

The fourth proportional to 1,229.06, 1,839.97 and 811.82 is: 1,215.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,229.06 : 1,839.97 = 811.82 : x
  2. Step 2: Convert to fraction form
    1,229.06/1,839.97 = 811.82/x
  3. Step 3: Cross multiply
    1,229.06x = 1,839.97 × 811.82
  4. Step 4: Simplify right side
    1,229.06x = 1,493,720.39
  5. Step 5: Solve for x
    x = 1,493,720.39/1,229.06
  6. Step 6: Final answer
    x = 1,215.34

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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.