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Finding the Fourth Proportional to 808.13, 1,212.68 and 548.30

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Solution

The fourth proportional to 808.13, 1,212.68 and 548.30 is: 822.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.13 : 1,212.68 = 548.30 : x
  2. Step 2: Convert to fraction form
    808.13/1,212.68 = 548.30/x
  3. Step 3: Cross multiply
    808.13x = 1,212.68 × 548.30
  4. Step 4: Simplify right side
    808.13x = 664,916.85
  5. Step 5: Solve for x
    x = 664,916.85/808.13
  6. Step 6: Final answer
    x = 822.78

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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.