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Finding the Fourth Proportional to 188.26, 259.63 and 122.79

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Solution

The fourth proportional to 188.26, 259.63 and 122.79 is: 169.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.26 : 259.63 = 122.79 : x
  2. Step 2: Convert to fraction form
    188.26/259.63 = 122.79/x
  3. Step 3: Cross multiply
    188.26x = 259.63 × 122.79
  4. Step 4: Simplify right side
    188.26x = 31,879.97
  5. Step 5: Solve for x
    x = 31,879.97/188.26
  6. Step 6: Final answer
    x = 169.34

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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.