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Finding the Fourth Proportional to 819.71, 1,227.94 and 387.17

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Solution

The fourth proportional to 819.71, 1,227.94 and 387.17 is: 579.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.71 : 1,227.94 = 387.17 : x
  2. Step 2: Convert to fraction form
    819.71/1,227.94 = 387.17/x
  3. Step 3: Cross multiply
    819.71x = 1,227.94 × 387.17
  4. Step 4: Simplify right side
    819.71x = 475,419.03
  5. Step 5: Solve for x
    x = 475,419.03/819.71
  6. Step 6: Final answer
    x = 579.99

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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.