Home / 20,823.28-28,739.40-13,272.96

Finding the Fourth Proportional to 20,823.28, 28,739.40 and 13,272.96

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Solution

The fourth proportional to 20,823.28, 28,739.40 and 13,272.96 is: 18,318.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,823.28 : 28,739.40 = 13,272.96 : x
  2. Step 2: Convert to fraction form
    20,823.28/28,739.40 = 13,272.96/x
  3. Step 3: Cross multiply
    20,823.28x = 28,739.40 × 13,272.96
  4. Step 4: Simplify right side
    20,823.28x = 381,456,906.62
  5. Step 5: Solve for x
    x = 381,456,906.62/20,823.28
  6. Step 6: Final answer
    x = 18,318.77

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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.