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Finding the Fourth Proportional to 126.39, 188.68 and 115.05

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Solution

The fourth proportional to 126.39, 188.68 and 115.05 is: 171.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.39 : 188.68 = 115.05 : x
  2. Step 2: Convert to fraction form
    126.39/188.68 = 115.05/x
  3. Step 3: Cross multiply
    126.39x = 188.68 × 115.05
  4. Step 4: Simplify right side
    126.39x = 21,707.35
  5. Step 5: Solve for x
    x = 21,707.35/126.39
  6. Step 6: Final answer
    x = 171.75

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.