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Finding the Fourth Proportional to 808.38, 1,211.78 and 346.26

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Solution

The fourth proportional to 808.38, 1,211.78 and 346.26 is: 519.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.38 : 1,211.78 = 346.26 : x
  2. Step 2: Convert to fraction form
    808.38/1,211.78 = 346.26/x
  3. Step 3: Cross multiply
    808.38x = 1,211.78 × 346.26
  4. Step 4: Simplify right side
    808.38x = 419,590.94
  5. Step 5: Solve for x
    x = 419,590.94/808.38
  6. Step 6: Final answer
    x = 519.05

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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.