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Finding the Fourth Proportional to 215.91, 297.89 and 122.65

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Solution

The fourth proportional to 215.91, 297.89 and 122.65 is: 169.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.91 : 297.89 = 122.65 : x
  2. Step 2: Convert to fraction form
    215.91/297.89 = 122.65/x
  3. Step 3: Cross multiply
    215.91x = 297.89 × 122.65
  4. Step 4: Simplify right side
    215.91x = 36,536.21
  5. Step 5: Solve for x
    x = 36,536.21/215.91
  6. Step 6: Final answer
    x = 169.22

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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.