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Finding the Fourth Proportional to 215.14, 296.85 and 121.87

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Solution

The fourth proportional to 215.14, 296.85 and 121.87 is: 168.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.14 : 296.85 = 121.87 : x
  2. Step 2: Convert to fraction form
    215.14/296.85 = 121.87/x
  3. Step 3: Cross multiply
    215.14x = 296.85 × 121.87
  4. Step 4: Simplify right side
    215.14x = 36,177.11
  5. Step 5: Solve for x
    x = 36,177.11/215.14
  6. Step 6: Final answer
    x = 168.16

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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.