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Finding the Fourth Proportional to 220,420.80, 330,890.40 and 218,865.60

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Solution

The fourth proportional to 220,420.80, 330,890.40 and 218,865.60 is: 328,555.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    220,420.80 : 330,890.40 = 218,865.60 : x
  2. Step 2: Convert to fraction form
    220,420.80/330,890.40 = 218,865.60/x
  3. Step 3: Cross multiply
    220,420.80x = 330,890.40 × 218,865.60
  4. Step 4: Simplify right side
    220,420.80x = 72,420,525,930.24
  5. Step 5: Solve for x
    x = 72,420,525,930.24/220,420.80
  6. Step 6: Final answer
    x = 328,555.77

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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.