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Finding the Fourth Proportional to 186.11, 256.86 and 127.88

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Solution

The fourth proportional to 186.11, 256.86 and 127.88 is: 176.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.11 : 256.86 = 127.88 : x
  2. Step 2: Convert to fraction form
    186.11/256.86 = 127.88/x
  3. Step 3: Cross multiply
    186.11x = 256.86 × 127.88
  4. Step 4: Simplify right side
    186.11x = 32,845.97
  5. Step 5: Solve for x
    x = 32,845.97/186.11
  6. Step 6: Final answer
    x = 176.49

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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.