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Finding the Fourth Proportional to 396.17, 546.72 and 221.51

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Solution

The fourth proportional to 396.17, 546.72 and 221.51 is: 305.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.17 : 546.72 = 221.51 : x
  2. Step 2: Convert to fraction form
    396.17/546.72 = 221.51/x
  3. Step 3: Cross multiply
    396.17x = 546.72 × 221.51
  4. Step 4: Simplify right side
    396.17x = 121,106.14
  5. Step 5: Solve for x
    x = 121,106.14/396.17
  6. Step 6: Final answer
    x = 305.69

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.