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Finding the Fourth Proportional to 186.17, 256.87 and 111.51

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Solution

The fourth proportional to 186.17, 256.87 and 111.51 is: 153.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.17 : 256.87 = 111.51 : x
  2. Step 2: Convert to fraction form
    186.17/256.87 = 111.51/x
  3. Step 3: Cross multiply
    186.17x = 256.87 × 111.51
  4. Step 4: Simplify right side
    186.17x = 28,642.01
  5. Step 5: Solve for x
    x = 28,642.01/186.17
  6. Step 6: Final answer
    x = 153.85

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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.