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Finding the Fourth Proportional to 808.31, 1,212.47 and 231.19

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Solution

The fourth proportional to 808.31, 1,212.47 and 231.19 is: 346.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.31 : 1,212.47 = 231.19 : x
  2. Step 2: Convert to fraction form
    808.31/1,212.47 = 231.19/x
  3. Step 3: Cross multiply
    808.31x = 1,212.47 × 231.19
  4. Step 4: Simplify right side
    808.31x = 280,307.62
  5. Step 5: Solve for x
    x = 280,307.62/808.31
  6. Step 6: Final answer
    x = 346.78

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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.