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Finding the Fourth Proportional to 187.09, 258.05 and 121.61

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Solution

The fourth proportional to 187.09, 258.05 and 121.61 is: 167.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.09 : 258.05 = 121.61 : x
  2. Step 2: Convert to fraction form
    187.09/258.05 = 121.61/x
  3. Step 3: Cross multiply
    187.09x = 258.05 × 121.61
  4. Step 4: Simplify right side
    187.09x = 31,382.41
  5. Step 5: Solve for x
    x = 31,382.41/187.09
  6. Step 6: Final answer
    x = 167.74

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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.