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Finding the Fourth Proportional to 220.86, 331.52 and 99.21

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Solution

The fourth proportional to 220.86, 331.52 and 99.21 is: 148.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.86 : 331.52 = 99.21 : x
  2. Step 2: Convert to fraction form
    220.86/331.52 = 99.21/x
  3. Step 3: Cross multiply
    220.86x = 331.52 × 99.21
  4. Step 4: Simplify right side
    220.86x = 32,889.26
  5. Step 5: Solve for x
    x = 32,889.26/220.86
  6. Step 6: Final answer
    x = 148.91

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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.