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Finding the Fourth Proportional to 126.69, 174.78 and 91.67

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Solution

The fourth proportional to 126.69, 174.78 and 91.67 is: 126.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.69 : 174.78 = 91.67 : x
  2. Step 2: Convert to fraction form
    126.69/174.78 = 91.67/x
  3. Step 3: Cross multiply
    126.69x = 174.78 × 91.67
  4. Step 4: Simplify right side
    126.69x = 16,020.75
  5. Step 5: Solve for x
    x = 16,020.75/126.69
  6. Step 6: Final answer
    x = 126.45

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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.