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Finding the Fourth Proportional to 215.21, 320.96 and 204.48

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Solution

The fourth proportional to 215.21, 320.96 and 204.48 is: 304.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.21 : 320.96 = 204.48 : x
  2. Step 2: Convert to fraction form
    215.21/320.96 = 204.48/x
  3. Step 3: Cross multiply
    215.21x = 320.96 × 204.48
  4. Step 4: Simplify right side
    215.21x = 65,629.90
  5. Step 5: Solve for x
    x = 65,629.90/215.21
  6. Step 6: Final answer
    x = 304.96

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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.