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Finding the Fourth Proportional to 819.42, 1,228.87 and 271.45

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Solution

The fourth proportional to 819.42, 1,228.87 and 271.45 is: 407.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.42 : 1,228.87 = 271.45 : x
  2. Step 2: Convert to fraction form
    819.42/1,228.87 = 271.45/x
  3. Step 3: Cross multiply
    819.42x = 1,228.87 × 271.45
  4. Step 4: Simplify right side
    819.42x = 333,578.64
  5. Step 5: Solve for x
    x = 333,578.64/819.42
  6. Step 6: Final answer
    x = 407.09

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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.