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Finding the Fourth Proportional to 215.92, 323.74 and 78.94

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Solution

The fourth proportional to 215.92, 323.74 and 78.94 is: 118.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.92 : 323.74 = 78.94 : x
  2. Step 2: Convert to fraction form
    215.92/323.74 = 78.94/x
  3. Step 3: Cross multiply
    215.92x = 323.74 × 78.94
  4. Step 4: Simplify right side
    215.92x = 25,556.04
  5. Step 5: Solve for x
    x = 25,556.04/215.92
  6. Step 6: Final answer
    x = 118.36

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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.