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Finding the Fourth Proportional to 808.13, 1,212.39 and 231

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Solution

The fourth proportional to 808.13, 1,212.39 and 231 is: 346.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.13 : 1,212.39 = 231 : x
  2. Step 2: Convert to fraction form
    808.13/1,212.39 = 231/x
  3. Step 3: Cross multiply
    808.13x = 1,212.39 × 231
  4. Step 4: Simplify right side
    808.13x = 280,062.09
  5. Step 5: Solve for x
    x = 280,062.09/808.13
  6. Step 6: Final answer
    x = 346.56

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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.