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Finding the Fourth Proportional to 820.52, 1,230 and 272.41

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Solution

The fourth proportional to 820.52, 1,230 and 272.41 is: 408.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.52 : 1,230 = 272.41 : x
  2. Step 2: Convert to fraction form
    820.52/1,230 = 272.41/x
  3. Step 3: Cross multiply
    820.52x = 1,230 × 272.41
  4. Step 4: Simplify right side
    820.52x = 335,064.30
  5. Step 5: Solve for x
    x = 335,064.30/820.52
  6. Step 6: Final answer
    x = 408.36

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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.