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Finding the Fourth Proportional to 220,216.80, 330,411.60 and 79,989.60

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Solution

The fourth proportional to 220,216.80, 330,411.60 and 79,989.60 is: 120,015.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    220,216.80 : 330,411.60 = 79,989.60 : x
  2. Step 2: Convert to fraction form
    220,216.80/330,411.60 = 79,989.60/x
  3. Step 3: Cross multiply
    220,216.80x = 330,411.60 × 79,989.60
  4. Step 4: Simplify right side
    220,216.80x = 26,429,491,719.36
  5. Step 5: Solve for x
    x = 26,429,491,719.36/220,216.80
  6. Step 6: Final answer
    x = 120,015.78

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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.