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Finding the Fourth Proportional to 215.16, 296.89 and 121.90

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Solution

The fourth proportional to 215.16, 296.89 and 121.90 is: 168.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.16 : 296.89 = 121.90 : x
  2. Step 2: Convert to fraction form
    215.16/296.89 = 121.90/x
  3. Step 3: Cross multiply
    215.16x = 296.89 × 121.90
  4. Step 4: Simplify right side
    215.16x = 36,190.89
  5. Step 5: Solve for x
    x = 36,190.89/215.16
  6. Step 6: Final answer
    x = 168.20

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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.