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Finding the Fourth Proportional to 215.56, 297.49 and 122.31

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Solution

The fourth proportional to 215.56, 297.49 and 122.31 is: 168.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.56 : 297.49 = 122.31 : x
  2. Step 2: Convert to fraction form
    215.56/297.49 = 122.31/x
  3. Step 3: Cross multiply
    215.56x = 297.49 × 122.31
  4. Step 4: Simplify right side
    215.56x = 36,386.00
  5. Step 5: Solve for x
    x = 36,386.00/215.56
  6. Step 6: Final answer
    x = 168.80

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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.