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Finding the Fourth Proportional to 220,520.82, 330,692.18 and 85,513.80

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Solution

The fourth proportional to 220,520.82, 330,692.18 and 85,513.80 is: 128,236.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    220,520.82 : 330,692.18 = 85,513.80 : x
  2. Step 2: Convert to fraction form
    220,520.82/330,692.18 = 85,513.80/x
  3. Step 3: Cross multiply
    220,520.82x = 330,692.18 × 85,513.80
  4. Step 4: Simplify right side
    220,520.82x = 28,278,745,425.81
  5. Step 5: Solve for x
    x = 28,278,745,425.81/220,520.82
  6. Step 6: Final answer
    x = 128,236.17

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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.