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Finding the Fourth Proportional to 820.79, 1,231.36 and 272.94

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Solution

The fourth proportional to 820.79, 1,231.36 and 272.94 is: 409.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.79 : 1,231.36 = 272.94 : x
  2. Step 2: Convert to fraction form
    820.79/1,231.36 = 272.94/x
  3. Step 3: Cross multiply
    820.79x = 1,231.36 × 272.94
  4. Step 4: Simplify right side
    820.79x = 336,086.03
  5. Step 5: Solve for x
    x = 336,086.03/820.79
  6. Step 6: Final answer
    x = 409.47

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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.