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Finding the Fourth Proportional to 220,662.88, 330,789.12 and 80,389.60

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Solution

The fourth proportional to 220,662.88, 330,789.12 and 80,389.60 is: 120,509.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    220,662.88 : 330,789.12 = 80,389.60 : x
  2. Step 2: Convert to fraction form
    220,662.88/330,789.12 = 80,389.60/x
  3. Step 3: Cross multiply
    220,662.88x = 330,789.12 × 80,389.60
  4. Step 4: Simplify right side
    220,662.88x = 26,592,005,041.15
  5. Step 5: Solve for x
    x = 26,592,005,041.15/220,662.88
  6. Step 6: Final answer
    x = 120,509.64

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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.