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Finding the Fourth Proportional to 809.83, 1,213.81 and 346.92

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Solution

The fourth proportional to 809.83, 1,213.81 and 346.92 is: 519.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.83 : 1,213.81 = 346.92 : x
  2. Step 2: Convert to fraction form
    809.83/1,213.81 = 346.92/x
  3. Step 3: Cross multiply
    809.83x = 1,213.81 × 346.92
  4. Step 4: Simplify right side
    809.83x = 421,094.97
  5. Step 5: Solve for x
    x = 421,094.97/809.83
  6. Step 6: Final answer
    x = 519.98

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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.