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Finding the Fourth Proportional to 318.23, 477.50 and 221.03

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Solution

The fourth proportional to 318.23, 477.50 and 221.03 is: 331.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.23 : 477.50 = 221.03 : x
  2. Step 2: Convert to fraction form
    318.23/477.50 = 221.03/x
  3. Step 3: Cross multiply
    318.23x = 477.50 × 221.03
  4. Step 4: Simplify right side
    318.23x = 105,540.12
  5. Step 5: Solve for x
    x = 105,540.12/318.23
  6. Step 6: Final answer
    x = 331.65

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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.