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Finding the Fourth Proportional to 187.76, 258.95 and 121.39

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Solution

The fourth proportional to 187.76, 258.95 and 121.39 is: 167.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.76 : 258.95 = 121.39 : x
  2. Step 2: Convert to fraction form
    187.76/258.95 = 121.39/x
  3. Step 3: Cross multiply
    187.76x = 258.95 × 121.39
  4. Step 4: Simplify right side
    187.76x = 31,433.60
  5. Step 5: Solve for x
    x = 31,433.60/187.76
  6. Step 6: Final answer
    x = 167.41

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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.