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Finding the Fourth Proportional to 136.89, 188.75 and 121.41

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Solution

The fourth proportional to 136.89, 188.75 and 121.41 is: 167.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.89 : 188.75 = 121.41 : x
  2. Step 2: Convert to fraction form
    136.89/188.75 = 121.41/x
  3. Step 3: Cross multiply
    136.89x = 188.75 × 121.41
  4. Step 4: Simplify right side
    136.89x = 22,915.53
  5. Step 5: Solve for x
    x = 22,915.53/136.89
  6. Step 6: Final answer
    x = 167.40

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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.