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Finding the Fourth Proportional to 394.63, 591.76 and 212.11

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Solution

The fourth proportional to 394.63, 591.76 and 212.11 is: 318.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.63 : 591.76 = 212.11 : x
  2. Step 2: Convert to fraction form
    394.63/591.76 = 212.11/x
  3. Step 3: Cross multiply
    394.63x = 591.76 × 212.11
  4. Step 4: Simplify right side
    394.63x = 125,517.00
  5. Step 5: Solve for x
    x = 125,517.00/394.63
  6. Step 6: Final answer
    x = 318.06

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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.