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Finding the Fourth Proportional to 187.01, 258.17 and 121.57

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Solution

The fourth proportional to 187.01, 258.17 and 121.57 is: 167.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.01 : 258.17 = 121.57 : x
  2. Step 2: Convert to fraction form
    187.01/258.17 = 121.57/x
  3. Step 3: Cross multiply
    187.01x = 258.17 × 121.57
  4. Step 4: Simplify right side
    187.01x = 31,385.73
  5. Step 5: Solve for x
    x = 31,385.73/187.01
  6. Step 6: Final answer
    x = 167.83

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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.