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Finding the Fourth Proportional to 220,615.70, 331,016.88 and 120,659.20

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Solution

The fourth proportional to 220,615.70, 331,016.88 and 120,659.20 is: 181,039.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    220,615.70 : 331,016.88 = 120,659.20 : x
  2. Step 2: Convert to fraction form
    220,615.70/331,016.88 = 120,659.20/x
  3. Step 3: Cross multiply
    220,615.70x = 331,016.88 × 120,659.20
  4. Step 4: Simplify right side
    220,615.70x = 39,940,231,927.30
  5. Step 5: Solve for x
    x = 39,940,231,927.30/220,615.70
  6. Step 6: Final answer
    x = 181,039.84

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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.