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Finding the Fourth Proportional to 319.29, 440.40 and 208.79

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Solution

The fourth proportional to 319.29, 440.40 and 208.79 is: 287.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.29 : 440.40 = 208.79 : x
  2. Step 2: Convert to fraction form
    319.29/440.40 = 208.79/x
  3. Step 3: Cross multiply
    319.29x = 440.40 × 208.79
  4. Step 4: Simplify right side
    319.29x = 91,951.12
  5. Step 5: Solve for x
    x = 91,951.12/319.29
  6. Step 6: Final answer
    x = 287.99

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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.