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Finding the Fourth Proportional to 188.89, 260.55 and 122.47

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Solution

The fourth proportional to 188.89, 260.55 and 122.47 is: 168.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.89 : 260.55 = 122.47 : x
  2. Step 2: Convert to fraction form
    188.89/260.55 = 122.47/x
  3. Step 3: Cross multiply
    188.89x = 260.55 × 122.47
  4. Step 4: Simplify right side
    188.89x = 31,909.56
  5. Step 5: Solve for x
    x = 31,909.56/188.89
  6. Step 6: Final answer
    x = 168.93

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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.