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Finding the Fourth Proportional to 398.21, 596.23 and 212.72

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Solution

The fourth proportional to 398.21, 596.23 and 212.72 is: 318.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.21 : 596.23 = 212.72 : x
  2. Step 2: Convert to fraction form
    398.21/596.23 = 212.72/x
  3. Step 3: Cross multiply
    398.21x = 596.23 × 212.72
  4. Step 4: Simplify right side
    398.21x = 126,826.53
  5. Step 5: Solve for x
    x = 126,826.53/398.21
  6. Step 6: Final answer
    x = 318.50

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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.