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Finding the Fourth Proportional to 809.37, 1,213.55 and 346.89

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Solution

The fourth proportional to 809.37, 1,213.55 and 346.89 is: 520.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.37 : 1,213.55 = 346.89 : x
  2. Step 2: Convert to fraction form
    809.37/1,213.55 = 346.89/x
  3. Step 3: Cross multiply
    809.37x = 1,213.55 × 346.89
  4. Step 4: Simplify right side
    809.37x = 420,972.48
  5. Step 5: Solve for x
    x = 420,972.48/809.37
  6. Step 6: Final answer
    x = 520.12

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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.