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Finding the Fourth Proportional to 187.19, 258.12 and 121.58

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Solution

The fourth proportional to 187.19, 258.12 and 121.58 is: 167.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.19 : 258.12 = 121.58 : x
  2. Step 2: Convert to fraction form
    187.19/258.12 = 121.58/x
  3. Step 3: Cross multiply
    187.19x = 258.12 × 121.58
  4. Step 4: Simplify right side
    187.19x = 31,380.94
  5. Step 5: Solve for x
    x = 31,380.94/187.19
  6. Step 6: Final answer
    x = 167.65

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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.