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Finding the Fourth Proportional to 215.28, 321.30 and 194.88

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Solution

The fourth proportional to 215.28, 321.30 and 194.88 is: 290.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.28 : 321.30 = 194.88 : x
  2. Step 2: Convert to fraction form
    215.28/321.30 = 194.88/x
  3. Step 3: Cross multiply
    215.28x = 321.30 × 194.88
  4. Step 4: Simplify right side
    215.28x = 62,614.94
  5. Step 5: Solve for x
    x = 62,614.94/215.28
  6. Step 6: Final answer
    x = 290.85

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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.