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Finding the Fourth Proportional to 319.98, 479.33 and 191.66

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Solution

The fourth proportional to 319.98, 479.33 and 191.66 is: 287.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.98 : 479.33 = 191.66 : x
  2. Step 2: Convert to fraction form
    319.98/479.33 = 191.66/x
  3. Step 3: Cross multiply
    319.98x = 479.33 × 191.66
  4. Step 4: Simplify right side
    319.98x = 91,868.39
  5. Step 5: Solve for x
    x = 91,868.39/319.98
  6. Step 6: Final answer
    x = 287.11

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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.