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Finding the Fourth Proportional to 221.47, 331.90 and 176.21

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Solution

The fourth proportional to 221.47, 331.90 and 176.21 is: 264.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.47 : 331.90 = 176.21 : x
  2. Step 2: Convert to fraction form
    221.47/331.90 = 176.21/x
  3. Step 3: Cross multiply
    221.47x = 331.90 × 176.21
  4. Step 4: Simplify right side
    221.47x = 58,483.24
  5. Step 5: Solve for x
    x = 58,483.24/221.47
  6. Step 6: Final answer
    x = 264.07

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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.