Home / 20,109.87-30,164.67-8,431.29

Finding the Fourth Proportional to 20,109.87, 30,164.67 and 8,431.29

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Solution

The fourth proportional to 20,109.87, 30,164.67 and 8,431.29 is: 12,646.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,109.87 : 30,164.67 = 8,431.29 : x
  2. Step 2: Convert to fraction form
    20,109.87/30,164.67 = 8,431.29/x
  3. Step 3: Cross multiply
    20,109.87x = 30,164.67 × 8,431.29
  4. Step 4: Simplify right side
    20,109.87x = 254,327,080.52
  5. Step 5: Solve for x
    x = 254,327,080.52/20,109.87
  6. Step 6: Final answer
    x = 12,646.88

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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.