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Finding the Fourth Proportional to 808.72, 1,213.12 and 346.54

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Solution

The fourth proportional to 808.72, 1,213.12 and 346.54 is: 519.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.72 : 1,213.12 = 346.54 : x
  2. Step 2: Convert to fraction form
    808.72/1,213.12 = 346.54/x
  3. Step 3: Cross multiply
    808.72x = 1,213.12 × 346.54
  4. Step 4: Simplify right side
    808.72x = 420,394.60
  5. Step 5: Solve for x
    x = 420,394.60/808.72
  6. Step 6: Final answer
    x = 519.83

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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.