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Finding the Fourth Proportional to 326.14, 489.38 and 189.31

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Solution

The fourth proportional to 326.14, 489.38 and 189.31 is: 284.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.14 : 489.38 = 189.31 : x
  2. Step 2: Convert to fraction form
    326.14/489.38 = 189.31/x
  3. Step 3: Cross multiply
    326.14x = 489.38 × 189.31
  4. Step 4: Simplify right side
    326.14x = 92,644.53
  5. Step 5: Solve for x
    x = 92,644.53/326.14
  6. Step 6: Final answer
    x = 284.06

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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.