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Finding the Fourth Proportional to 235.48, 354.45 and 213.12

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Solution

The fourth proportional to 235.48, 354.45 and 213.12 is: 320.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    235.48 : 354.45 = 213.12 : x
  2. Step 2: Convert to fraction form
    235.48/354.45 = 213.12/x
  3. Step 3: Cross multiply
    235.48x = 354.45 × 213.12
  4. Step 4: Simplify right side
    235.48x = 75,540.38
  5. Step 5: Solve for x
    x = 75,540.38/235.48
  6. Step 6: Final answer
    x = 320.79

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.