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Finding the Fourth Proportional to 820.77, 1,231.19 and 272.97

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Solution

The fourth proportional to 820.77, 1,231.19 and 272.97 is: 409.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.77 : 1,231.19 = 272.97 : x
  2. Step 2: Convert to fraction form
    820.77/1,231.19 = 272.97/x
  3. Step 3: Cross multiply
    820.77x = 1,231.19 × 272.97
  4. Step 4: Simplify right side
    820.77x = 336,076.57
  5. Step 5: Solve for x
    x = 336,076.57/820.77
  6. Step 6: Final answer
    x = 409.46

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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.