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Finding the Fourth Proportional to 220,205.80, 330,438.30 and 79,978.60

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Solution

The fourth proportional to 220,205.80, 330,438.30 and 79,978.60 is: 120,014.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    220,205.80 : 330,438.30 = 79,978.60 : x
  2. Step 2: Convert to fraction form
    220,205.80/330,438.30 = 79,978.60/x
  3. Step 3: Cross multiply
    220,205.80x = 330,438.30 × 79,978.60
  4. Step 4: Simplify right side
    220,205.80x = 26,427,992,620.38
  5. Step 5: Solve for x
    x = 26,427,992,620.38/220,205.80
  6. Step 6: Final answer
    x = 120,014.97

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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.