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Finding the Fourth Proportional to 819.96, 1,230.11 and 386.88

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Solution

The fourth proportional to 819.96, 1,230.11 and 386.88 is: 580.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.96 : 1,230.11 = 386.88 : x
  2. Step 2: Convert to fraction form
    819.96/1,230.11 = 386.88/x
  3. Step 3: Cross multiply
    819.96x = 1,230.11 × 386.88
  4. Step 4: Simplify right side
    819.96x = 475,904.96
  5. Step 5: Solve for x
    x = 475,904.96/819.96
  6. Step 6: Final answer
    x = 580.40

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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.