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Finding the Fourth Proportional to 215.20, 296.99 and 121.96

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Solution

The fourth proportional to 215.20, 296.99 and 121.96 is: 168.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.20 : 296.99 = 121.96 : x
  2. Step 2: Convert to fraction form
    215.20/296.99 = 121.96/x
  3. Step 3: Cross multiply
    215.20x = 296.99 × 121.96
  4. Step 4: Simplify right side
    215.20x = 36,220.90
  5. Step 5: Solve for x
    x = 36,220.90/215.20
  6. Step 6: Final answer
    x = 168.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.