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Finding the Fourth Proportional to 186.39, 256.82 and 120.75

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Solution

The fourth proportional to 186.39, 256.82 and 120.75 is: 166.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.39 : 256.82 = 120.75 : x
  2. Step 2: Convert to fraction form
    186.39/256.82 = 120.75/x
  3. Step 3: Cross multiply
    186.39x = 256.82 × 120.75
  4. Step 4: Simplify right side
    186.39x = 31,010.41
  5. Step 5: Solve for x
    x = 31,010.41/186.39
  6. Step 6: Final answer
    x = 166.37

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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.