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Finding the Fourth Proportional to 187.08, 258.07 and 121.61

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Solution

The fourth proportional to 187.08, 258.07 and 121.61 is: 167.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.08 : 258.07 = 121.61 : x
  2. Step 2: Convert to fraction form
    187.08/258.07 = 121.61/x
  3. Step 3: Cross multiply
    187.08x = 258.07 × 121.61
  4. Step 4: Simplify right side
    187.08x = 31,383.89
  5. Step 5: Solve for x
    x = 31,383.89/187.08
  6. Step 6: Final answer
    x = 167.76

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.