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Finding the Fourth Proportional to 188.25, 259.72 and 122.79

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Solution

The fourth proportional to 188.25, 259.72 and 122.79 is: 169.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.25 : 259.72 = 122.79 : x
  2. Step 2: Convert to fraction form
    188.25/259.72 = 122.79/x
  3. Step 3: Cross multiply
    188.25x = 259.72 × 122.79
  4. Step 4: Simplify right side
    188.25x = 31,891.02
  5. Step 5: Solve for x
    x = 31,891.02/188.25
  6. Step 6: Final answer
    x = 169.41

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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.