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Finding the Fourth Proportional to 126.67, 174.74 and 87.26

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Solution

The fourth proportional to 126.67, 174.74 and 87.26 is: 120.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.67 : 174.74 = 87.26 : x
  2. Step 2: Convert to fraction form
    126.67/174.74 = 87.26/x
  3. Step 3: Cross multiply
    126.67x = 174.74 × 87.26
  4. Step 4: Simplify right side
    126.67x = 15,247.81
  5. Step 5: Solve for x
    x = 15,247.81/126.67
  6. Step 6: Final answer
    x = 120.37

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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.