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Finding the Fourth Proportional to 819.03, 1,228.70 and 386.19

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Solution

The fourth proportional to 819.03, 1,228.70 and 386.19 is: 579.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.03 : 1,228.70 = 386.19 : x
  2. Step 2: Convert to fraction form
    819.03/1,228.70 = 386.19/x
  3. Step 3: Cross multiply
    819.03x = 1,228.70 × 386.19
  4. Step 4: Simplify right side
    819.03x = 474,511.65
  5. Step 5: Solve for x
    x = 474,511.65/819.03
  6. Step 6: Final answer
    x = 579.36

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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.