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Finding the Fourth Proportional to 394.99, 591.19 and 212.11

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Solution

The fourth proportional to 394.99, 591.19 and 212.11 is: 317.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.99 : 591.19 = 212.11 : x
  2. Step 2: Convert to fraction form
    394.99/591.19 = 212.11/x
  3. Step 3: Cross multiply
    394.99x = 591.19 × 212.11
  4. Step 4: Simplify right side
    394.99x = 125,397.31
  5. Step 5: Solve for x
    x = 125,397.31/394.99
  6. Step 6: Final answer
    x = 317.47

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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.