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Finding the Fourth Proportional to 215.43, 323.14 and 78.37

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Solution

The fourth proportional to 215.43, 323.14 and 78.37 is: 117.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.43 : 323.14 = 78.37 : x
  2. Step 2: Convert to fraction form
    215.43/323.14 = 78.37/x
  3. Step 3: Cross multiply
    215.43x = 323.14 × 78.37
  4. Step 4: Simplify right side
    215.43x = 25,325.44
  5. Step 5: Solve for x
    x = 25,325.44/215.43
  6. Step 6: Final answer
    x = 117.56

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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.