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Finding the Fourth Proportional to 188.28, 259.71 and 121.97

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Solution

The fourth proportional to 188.28, 259.71 and 121.97 is: 168.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.28 : 259.71 = 121.97 : x
  2. Step 2: Convert to fraction form
    188.28/259.71 = 121.97/x
  3. Step 3: Cross multiply
    188.28x = 259.71 × 121.97
  4. Step 4: Simplify right side
    188.28x = 31,677.02
  5. Step 5: Solve for x
    x = 31,677.02/188.28
  6. Step 6: Final answer
    x = 168.25

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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.