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Finding the Fourth Proportional to 821.19, 1,231.45 and 273.22

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Solution

The fourth proportional to 821.19, 1,231.45 and 273.22 is: 409.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.19 : 1,231.45 = 273.22 : x
  2. Step 2: Convert to fraction form
    821.19/1,231.45 = 273.22/x
  3. Step 3: Cross multiply
    821.19x = 1,231.45 × 273.22
  4. Step 4: Simplify right side
    821.19x = 336,461.47
  5. Step 5: Solve for x
    x = 336,461.47/821.19
  6. Step 6: Final answer
    x = 409.73

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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.