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Finding the Fourth Proportional to 220,969.60, 331,502.40 and 80,728

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Solution

The fourth proportional to 220,969.60, 331,502.40 and 80,728 is: 121,109.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    220,969.60 : 331,502.40 = 80,728 : x
  2. Step 2: Convert to fraction form
    220,969.60/331,502.40 = 80,728/x
  3. Step 3: Cross multiply
    220,969.60x = 331,502.40 × 80,728
  4. Step 4: Simplify right side
    220,969.60x = 26,761,525,747.20
  5. Step 5: Solve for x
    x = 26,761,525,747.20/220,969.60
  6. Step 6: Final answer
    x = 121,109.54

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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.