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Finding the Fourth Proportional to 394.80, 591.85 and 212.32

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Solution

The fourth proportional to 394.80, 591.85 and 212.32 is: 318.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.80 : 591.85 = 212.32 : x
  2. Step 2: Convert to fraction form
    394.80/591.85 = 212.32/x
  3. Step 3: Cross multiply
    394.80x = 591.85 × 212.32
  4. Step 4: Simplify right side
    394.80x = 125,661.59
  5. Step 5: Solve for x
    x = 125,661.59/394.80
  6. Step 6: Final answer
    x = 318.29

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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.