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Finding the Fourth Proportional to 215.20, 323.10 and 164.20

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Solution

The fourth proportional to 215.20, 323.10 and 164.20 is: 246.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.20 : 323.10 = 164.20 : x
  2. Step 2: Convert to fraction form
    215.20/323.10 = 164.20/x
  3. Step 3: Cross multiply
    215.20x = 323.10 × 164.20
  4. Step 4: Simplify right side
    215.20x = 53,053.02
  5. Step 5: Solve for x
    x = 53,053.02/215.20
  6. Step 6: Final answer
    x = 246.53

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.