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Finding the Fourth Proportional to 126.22, 189.38 and 74.91

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Solution

The fourth proportional to 126.22, 189.38 and 74.91 is: 112.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.22 : 189.38 = 74.91 : x
  2. Step 2: Convert to fraction form
    126.22/189.38 = 74.91/x
  3. Step 3: Cross multiply
    126.22x = 189.38 × 74.91
  4. Step 4: Simplify right side
    126.22x = 14,186.46
  5. Step 5: Solve for x
    x = 14,186.46/126.22
  6. Step 6: Final answer
    x = 112.39

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.