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Finding the Fourth Proportional to 319.11, 440.22 and 208.55

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Solution

The fourth proportional to 319.11, 440.22 and 208.55 is: 287.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.11 : 440.22 = 208.55 : x
  2. Step 2: Convert to fraction form
    319.11/440.22 = 208.55/x
  3. Step 3: Cross multiply
    319.11x = 440.22 × 208.55
  4. Step 4: Simplify right side
    319.11x = 91,807.88
  5. Step 5: Solve for x
    x = 91,807.88/319.11
  6. Step 6: Final answer
    x = 287.70

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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.