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Finding the Fourth Proportional to 215.97, 323.87 and 78.98

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Solution

The fourth proportional to 215.97, 323.87 and 78.98 is: 118.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.97 : 323.87 = 78.98 : x
  2. Step 2: Convert to fraction form
    215.97/323.87 = 78.98/x
  3. Step 3: Cross multiply
    215.97x = 323.87 × 78.98
  4. Step 4: Simplify right side
    215.97x = 25,577.63
  5. Step 5: Solve for x
    x = 25,577.63/215.97
  6. Step 6: Final answer
    x = 118.43

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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.