Home / 20,439.10-28,204.21-11,485.90

Finding the Fourth Proportional to 20,439.10, 28,204.21 and 11,485.90

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Solution

The fourth proportional to 20,439.10, 28,204.21 and 11,485.90 is: 15,849.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,439.10 : 28,204.21 = 11,485.90 : x
  2. Step 2: Convert to fraction form
    20,439.10/28,204.21 = 11,485.90/x
  3. Step 3: Cross multiply
    20,439.10x = 28,204.21 × 11,485.90
  4. Step 4: Simplify right side
    20,439.10x = 323,950,735.64
  5. Step 5: Solve for x
    x = 323,950,735.64/20,439.10
  6. Step 6: Final answer
    x = 15,849.56

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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.