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Finding the Fourth Proportional to 318.62, 477.68 and 221.18

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Solution

The fourth proportional to 318.62, 477.68 and 221.18 is: 331.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.62 : 477.68 = 221.18 : x
  2. Step 2: Convert to fraction form
    318.62/477.68 = 221.18/x
  3. Step 3: Cross multiply
    318.62x = 477.68 × 221.18
  4. Step 4: Simplify right side
    318.62x = 105,653.26
  5. Step 5: Solve for x
    x = 105,653.26/318.62
  6. Step 6: Final answer
    x = 331.60

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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.