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Finding the Fourth Proportional to 235, 324.28 and 136.78

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Solution

The fourth proportional to 235, 324.28 and 136.78 is: 188.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    235 : 324.28 = 136.78 : x
  2. Step 2: Convert to fraction form
    235/324.28 = 136.78/x
  3. Step 3: Cross multiply
    235x = 324.28 × 136.78
  4. Step 4: Simplify right side
    235x = 44,355.02
  5. Step 5: Solve for x
    x = 44,355.02/235
  6. Step 6: Final answer
    x = 188.74

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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.