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Finding the Fourth Proportional to 319.81, 479.78 and 189.94

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Solution

The fourth proportional to 319.81, 479.78 and 189.94 is: 284.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.81 : 479.78 = 189.94 : x
  2. Step 2: Convert to fraction form
    319.81/479.78 = 189.94/x
  3. Step 3: Cross multiply
    319.81x = 479.78 × 189.94
  4. Step 4: Simplify right side
    319.81x = 91,129.41
  5. Step 5: Solve for x
    x = 91,129.41/319.81
  6. Step 6: Final answer
    x = 284.95

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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.