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Finding the Fourth Proportional to 121.99, 182.78 and 100.39

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Solution

The fourth proportional to 121.99, 182.78 and 100.39 is: 150.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.99 : 182.78 = 100.39 : x
  2. Step 2: Convert to fraction form
    121.99/182.78 = 100.39/x
  3. Step 3: Cross multiply
    121.99x = 182.78 × 100.39
  4. Step 4: Simplify right side
    121.99x = 18,349.54
  5. Step 5: Solve for x
    x = 18,349.54/121.99
  6. Step 6: Final answer
    x = 150.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.