Home / 20,439.72-28,206.42-11,487.09

Finding the Fourth Proportional to 20,439.72, 28,206.42 and 11,487.09

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Solution

The fourth proportional to 20,439.72, 28,206.42 and 11,487.09 is: 15,851.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,439.72 : 28,206.42 = 11,487.09 : x
  2. Step 2: Convert to fraction form
    20,439.72/28,206.42 = 11,487.09/x
  3. Step 3: Cross multiply
    20,439.72x = 28,206.42 × 11,487.09
  4. Step 4: Simplify right side
    20,439.72x = 324,009,685.12
  5. Step 5: Solve for x
    x = 324,009,685.12/20,439.72
  6. Step 6: Final answer
    x = 15,851.96

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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.