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Finding the Fourth Proportional to 220.77, 331.21 and 117.99

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Solution

The fourth proportional to 220.77, 331.21 and 117.99 is: 177.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.77 : 331.21 = 117.99 : x
  2. Step 2: Convert to fraction form
    220.77/331.21 = 117.99/x
  3. Step 3: Cross multiply
    220.77x = 331.21 × 117.99
  4. Step 4: Simplify right side
    220.77x = 39,079.47
  5. Step 5: Solve for x
    x = 39,079.47/220.77
  6. Step 6: Final answer
    x = 177.01

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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.