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Finding the Fourth Proportional to 220.99, 331.53 and 66.91

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Solution

The fourth proportional to 220.99, 331.53 and 66.91 is: 100.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.99 : 331.53 = 66.91 : x
  2. Step 2: Convert to fraction form
    220.99/331.53 = 66.91/x
  3. Step 3: Cross multiply
    220.99x = 331.53 × 66.91
  4. Step 4: Simplify right side
    220.99x = 22,182.67
  5. Step 5: Solve for x
    x = 22,182.67/220.99
  6. Step 6: Final answer
    x = 100.38

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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.