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Finding the Fourth Proportional to 220,286.80, 330,430.20 and 205,415.20

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Solution

The fourth proportional to 220,286.80, 330,430.20 and 205,415.20 is: 308,122.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    220,286.80 : 330,430.20 = 205,415.20 : x
  2. Step 2: Convert to fraction form
    220,286.80/330,430.20 = 205,415.20/x
  3. Step 3: Cross multiply
    220,286.80x = 330,430.20 × 205,415.20
  4. Step 4: Simplify right side
    220,286.80x = 67,875,385,619.04
  5. Step 5: Solve for x
    x = 67,875,385,619.04/220,286.80
  6. Step 6: Final answer
    x = 308,122.80

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1.5x scale

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.