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Finding the Fourth Proportional to 126.55, 190.51 and 115.21

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Solution

The fourth proportional to 126.55, 190.51 and 115.21 is: 173.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.55 : 190.51 = 115.21 : x
  2. Step 2: Convert to fraction form
    126.55/190.51 = 115.21/x
  3. Step 3: Cross multiply
    126.55x = 190.51 × 115.21
  4. Step 4: Simplify right side
    126.55x = 21,948.66
  5. Step 5: Solve for x
    x = 21,948.66/126.55
  6. Step 6: Final answer
    x = 173.44

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.