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Finding the Fourth Proportional to 187.63, 258.78 and 122.23

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Solution

The fourth proportional to 187.63, 258.78 and 122.23 is: 168.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.63 : 258.78 = 122.23 : x
  2. Step 2: Convert to fraction form
    187.63/258.78 = 122.23/x
  3. Step 3: Cross multiply
    187.63x = 258.78 × 122.23
  4. Step 4: Simplify right side
    187.63x = 31,630.68
  5. Step 5: Solve for x
    x = 31,630.68/187.63
  6. Step 6: Final answer
    x = 168.58

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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.