Home / 20,139.55-30,201.09-8,742.20

Finding the Fourth Proportional to 20,139.55, 30,201.09 and 8,742.20

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Solution

The fourth proportional to 20,139.55, 30,201.09 and 8,742.20 is: 13,109.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,139.55 : 30,201.09 = 8,742.20 : x
  2. Step 2: Convert to fraction form
    20,139.55/30,201.09 = 8,742.20/x
  3. Step 3: Cross multiply
    20,139.55x = 30,201.09 × 8,742.20
  4. Step 4: Simplify right side
    20,139.55x = 264,024,013.21
  5. Step 5: Solve for x
    x = 264,024,013.21/20,139.55
  6. Step 6: Final answer
    x = 13,109.73

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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.