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Finding the Fourth Proportional to 215.54, 297.44 and 122.28

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Solution

The fourth proportional to 215.54, 297.44 and 122.28 is: 168.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.54 : 297.44 = 122.28 : x
  2. Step 2: Convert to fraction form
    215.54/297.44 = 122.28/x
  3. Step 3: Cross multiply
    215.54x = 297.44 × 122.28
  4. Step 4: Simplify right side
    215.54x = 36,370.22
  5. Step 5: Solve for x
    x = 36,370.22/215.54
  6. Step 6: Final answer
    x = 168.74

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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.