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Finding the Fourth Proportional to 187.32, 258.38 and 121.90

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Solution

The fourth proportional to 187.32, 258.38 and 121.90 is: 168.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.32 : 258.38 = 121.90 : x
  2. Step 2: Convert to fraction form
    187.32/258.38 = 121.90/x
  3. Step 3: Cross multiply
    187.32x = 258.38 × 121.90
  4. Step 4: Simplify right side
    187.32x = 31,496.52
  5. Step 5: Solve for x
    x = 31,496.52/187.32
  6. Step 6: Final answer
    x = 168.14

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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.