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Finding the Fourth Proportional to 187.72, 258.91 and 121.34

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Solution

The fourth proportional to 187.72, 258.91 and 121.34 is: 167.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.72 : 258.91 = 121.34 : x
  2. Step 2: Convert to fraction form
    187.72/258.91 = 121.34/x
  3. Step 3: Cross multiply
    187.72x = 258.91 × 121.34
  4. Step 4: Simplify right side
    187.72x = 31,416.14
  5. Step 5: Solve for x
    x = 31,416.14/187.72
  6. Step 6: Final answer
    x = 167.36

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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.