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Finding the Fourth Proportional to 215.62, 321.99 and 180.80

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Solution

The fourth proportional to 215.62, 321.99 and 180.80 is: 269.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.62 : 321.99 = 180.80 : x
  2. Step 2: Convert to fraction form
    215.62/321.99 = 180.80/x
  3. Step 3: Cross multiply
    215.62x = 321.99 × 180.80
  4. Step 4: Simplify right side
    215.62x = 58,215.79
  5. Step 5: Solve for x
    x = 58,215.79/215.62
  6. Step 6: Final answer
    x = 269.99

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.