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Finding the Fourth Proportional to 319.88, 441.60 and 209.30

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Solution

The fourth proportional to 319.88, 441.60 and 209.30 is: 288.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.88 : 441.60 = 209.30 : x
  2. Step 2: Convert to fraction form
    319.88/441.60 = 209.30/x
  3. Step 3: Cross multiply
    319.88x = 441.60 × 209.30
  4. Step 4: Simplify right side
    319.88x = 92,426.88
  5. Step 5: Solve for x
    x = 92,426.88/319.88
  6. Step 6: Final answer
    x = 288.94

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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.