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Finding the Fourth Proportional to 121.94, 183.62 and 87.94

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Solution

The fourth proportional to 121.94, 183.62 and 87.94 is: 132.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.94 : 183.62 = 87.94 : x
  2. Step 2: Convert to fraction form
    121.94/183.62 = 87.94/x
  3. Step 3: Cross multiply
    121.94x = 183.62 × 87.94
  4. Step 4: Simplify right side
    121.94x = 16,147.19
  5. Step 5: Solve for x
    x = 16,147.19/121.94
  6. Step 6: Final answer
    x = 132.42

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.