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Finding the Fourth Proportional to 20,245.65, 27,920.80 and 12,692.80

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Solution

The fourth proportional to 20,245.65, 27,920.80 and 12,692.80 is: 17,504.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,245.65 : 27,920.80 = 12,692.80 : x
  2. Step 2: Convert to fraction form
    20,245.65/27,920.80 = 12,692.80/x
  3. Step 3: Cross multiply
    20,245.65x = 27,920.80 × 12,692.80
  4. Step 4: Simplify right side
    20,245.65x = 354,393,181.01
  5. Step 5: Solve for x
    x = 354,393,181.01/20,245.65
  6. Step 6: Final answer
    x = 17,504.66

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.