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Finding the Fourth Proportional to 126.81, 174.69 and 118.98

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Solution

The fourth proportional to 126.81, 174.69 and 118.98 is: 163.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.81 : 174.69 = 118.98 : x
  2. Step 2: Convert to fraction form
    126.81/174.69 = 118.98/x
  3. Step 3: Cross multiply
    126.81x = 174.69 × 118.98
  4. Step 4: Simplify right side
    126.81x = 20,784.62
  5. Step 5: Solve for x
    x = 20,784.62/126.81
  6. Step 6: Final answer
    x = 163.90

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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.