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Finding the Fourth Proportional to 319.94, 441.24 and 209.45

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Solution

The fourth proportional to 319.94, 441.24 and 209.45 is: 288.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.94 : 441.24 = 209.45 : x
  2. Step 2: Convert to fraction form
    319.94/441.24 = 209.45/x
  3. Step 3: Cross multiply
    319.94x = 441.24 × 209.45
  4. Step 4: Simplify right side
    319.94x = 92,418.04
  5. Step 5: Solve for x
    x = 92,418.04/319.94
  6. Step 6: Final answer
    x = 288.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.