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Finding the Fourth Proportional to 452.15, 678.26 and 221.16

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Solution

The fourth proportional to 452.15, 678.26 and 221.16 is: 331.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    452.15 : 678.26 = 221.16 : x
  2. Step 2: Convert to fraction form
    452.15/678.26 = 221.16/x
  3. Step 3: Cross multiply
    452.15x = 678.26 × 221.16
  4. Step 4: Simplify right side
    452.15x = 150,002.88
  5. Step 5: Solve for x
    x = 150,002.88/452.15
  6. Step 6: Final answer
    x = 331.76

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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.