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Finding the Fourth Proportional to 215.20, 321.60 and 173.61

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Solution

The fourth proportional to 215.20, 321.60 and 173.61 is: 259.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.20 : 321.60 = 173.61 : x
  2. Step 2: Convert to fraction form
    215.20/321.60 = 173.61/x
  3. Step 3: Cross multiply
    215.20x = 321.60 × 173.61
  4. Step 4: Simplify right side
    215.20x = 55,832.98
  5. Step 5: Solve for x
    x = 55,832.98/215.20
  6. Step 6: Final answer
    x = 259.45

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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.