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Finding the Fourth Proportional to 215.39, 297.20 and 122.12

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Solution

The fourth proportional to 215.39, 297.20 and 122.12 is: 168.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.39 : 297.20 = 122.12 : x
  2. Step 2: Convert to fraction form
    215.39/297.20 = 122.12/x
  3. Step 3: Cross multiply
    215.39x = 297.20 × 122.12
  4. Step 4: Simplify right side
    215.39x = 36,292.88
  5. Step 5: Solve for x
    x = 36,292.88/215.39
  6. Step 6: Final answer
    x = 168.50

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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.