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Finding the Fourth Proportional to 187.58, 258.78 and 122.09

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Solution

The fourth proportional to 187.58, 258.78 and 122.09 is: 168.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.58 : 258.78 = 122.09 : x
  2. Step 2: Convert to fraction form
    187.58/258.78 = 122.09/x
  3. Step 3: Cross multiply
    187.58x = 258.78 × 122.09
  4. Step 4: Simplify right side
    187.58x = 31,594.45
  5. Step 5: Solve for x
    x = 31,594.45/187.58
  6. Step 6: Final answer
    x = 168.43

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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.