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Finding the Fourth Proportional to 235.28, 324.24 and 211.72

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Solution

The fourth proportional to 235.28, 324.24 and 211.72 is: 291.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    235.28 : 324.24 = 211.72 : x
  2. Step 2: Convert to fraction form
    235.28/324.24 = 211.72/x
  3. Step 3: Cross multiply
    235.28x = 324.24 × 211.72
  4. Step 4: Simplify right side
    235.28x = 68,646.47
  5. Step 5: Solve for x
    x = 68,646.47/235.28
  6. Step 6: Final answer
    x = 291.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.