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Finding the Fourth Proportional to 188.27, 259.93 and 121.91

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Solution

The fourth proportional to 188.27, 259.93 and 121.91 is: 168.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.27 : 259.93 = 121.91 : x
  2. Step 2: Convert to fraction form
    188.27/259.93 = 121.91/x
  3. Step 3: Cross multiply
    188.27x = 259.93 × 121.91
  4. Step 4: Simplify right side
    188.27x = 31,688.07
  5. Step 5: Solve for x
    x = 31,688.07/188.27
  6. Step 6: Final answer
    x = 168.31

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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.