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Finding the Fourth Proportional to 220,721.20, 331,081.80 and 54,509.20

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Solution

The fourth proportional to 220,721.20, 331,081.80 and 54,509.20 is: 81,763.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    220,721.20 : 331,081.80 = 54,509.20 : x
  2. Step 2: Convert to fraction form
    220,721.20/331,081.80 = 54,509.20/x
  3. Step 3: Cross multiply
    220,721.20x = 331,081.80 × 54,509.20
  4. Step 4: Simplify right side
    220,721.20x = 18,047,004,052.56
  5. Step 5: Solve for x
    x = 18,047,004,052.56/220,721.20
  6. Step 6: Final answer
    x = 81,763.80

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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.