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Finding the Fourth Proportional to 394.65, 591.96 and 189.15

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Solution

The fourth proportional to 394.65, 591.96 and 189.15 is: 283.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.65 : 591.96 = 189.15 : x
  2. Step 2: Convert to fraction form
    394.65/591.96 = 189.15/x
  3. Step 3: Cross multiply
    394.65x = 591.96 × 189.15
  4. Step 4: Simplify right side
    394.65x = 111,969.23
  5. Step 5: Solve for x
    x = 111,969.23/394.65
  6. Step 6: Final answer
    x = 283.72

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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.