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Finding the Fourth Proportional to 20,190.80, 30,287.64 and 7,039.28

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Solution

The fourth proportional to 20,190.80, 30,287.64 and 7,039.28 is: 10,559.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,190.80 : 30,287.64 = 7,039.28 : x
  2. Step 2: Convert to fraction form
    20,190.80/30,287.64 = 7,039.28/x
  3. Step 3: Cross multiply
    20,190.80x = 30,287.64 × 7,039.28
  4. Step 4: Simplify right side
    20,190.80x = 213,203,178.50
  5. Step 5: Solve for x
    x = 213,203,178.50/20,190.80
  6. Step 6: Final answer
    x = 10,559.42

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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.