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Finding the Fourth Proportional to 43,540.80, 65,311.20 and 20,212.80

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Solution

The fourth proportional to 43,540.80, 65,311.20 and 20,212.80 is: 30,319.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,540.80 : 65,311.20 = 20,212.80 : x
  2. Step 2: Convert to fraction form
    43,540.80/65,311.20 = 20,212.80/x
  3. Step 3: Cross multiply
    43,540.80x = 65,311.20 × 20,212.80
  4. Step 4: Simplify right side
    43,540.80x = 1,320,122,223.36
  5. Step 5: Solve for x
    x = 1,320,122,223.36/43,540.80
  6. Step 6: Final answer
    x = 30,319.20

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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.