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Finding the Fourth Proportional to 193.92, 290.79 and 78.39

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Solution

The fourth proportional to 193.92, 290.79 and 78.39 is: 117.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    193.92 : 290.79 = 78.39 : x
  2. Step 2: Convert to fraction form
    193.92/290.79 = 78.39/x
  3. Step 3: Cross multiply
    193.92x = 290.79 × 78.39
  4. Step 4: Simplify right side
    193.92x = 22,795.03
  5. Step 5: Solve for x
    x = 22,795.03/193.92
  6. Step 6: Final answer
    x = 117.55

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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.