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Finding the Fourth Proportional to 188.28, 259.81 and 121.99

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Solution

The fourth proportional to 188.28, 259.81 and 121.99 is: 168.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.28 : 259.81 = 121.99 : x
  2. Step 2: Convert to fraction form
    188.28/259.81 = 121.99/x
  3. Step 3: Cross multiply
    188.28x = 259.81 × 121.99
  4. Step 4: Simplify right side
    188.28x = 31,694.22
  5. Step 5: Solve for x
    x = 31,694.22/188.28
  6. Step 6: Final answer
    x = 168.34

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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.