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Finding the Fourth Proportional to 126.11, 174.01 and 72.21

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Solution

The fourth proportional to 126.11, 174.01 and 72.21 is: 99.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.11 : 174.01 = 72.21 : x
  2. Step 2: Convert to fraction form
    126.11/174.01 = 72.21/x
  3. Step 3: Cross multiply
    126.11x = 174.01 × 72.21
  4. Step 4: Simplify right side
    126.11x = 12,564.43
  5. Step 5: Solve for x
    x = 12,564.43/126.11
  6. Step 6: Final answer
    x = 99.63

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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.