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Finding the Fourth Proportional to 126.84, 189.18 and 111.72

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Solution

The fourth proportional to 126.84, 189.18 and 111.72 is: 166.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.84 : 189.18 = 111.72 : x
  2. Step 2: Convert to fraction form
    126.84/189.18 = 111.72/x
  3. Step 3: Cross multiply
    126.84x = 189.18 × 111.72
  4. Step 4: Simplify right side
    126.84x = 21,135.19
  5. Step 5: Solve for x
    x = 21,135.19/126.84
  6. Step 6: Final answer
    x = 166.63

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.