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Finding the Fourth Proportional to 809.31, 1,212.93 and 346.97

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Solution

The fourth proportional to 809.31, 1,212.93 and 346.97 is: 520.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.31 : 1,212.93 = 346.97 : x
  2. Step 2: Convert to fraction form
    809.31/1,212.93 = 346.97/x
  3. Step 3: Cross multiply
    809.31x = 1,212.93 × 346.97
  4. Step 4: Simplify right side
    809.31x = 420,844.26
  5. Step 5: Solve for x
    x = 420,844.26/809.31
  6. Step 6: Final answer
    x = 520.00

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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.