Home / 20,945.39-28,906.40-11,515.73

Finding the Fourth Proportional to 20,945.39, 28,906.40 and 11,515.73

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Solution

The fourth proportional to 20,945.39, 28,906.40 and 11,515.73 is: 15,892.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,945.39 : 28,906.40 = 11,515.73 : x
  2. Step 2: Convert to fraction form
    20,945.39/28,906.40 = 11,515.73/x
  3. Step 3: Cross multiply
    20,945.39x = 28,906.40 × 11,515.73
  4. Step 4: Simplify right side
    20,945.39x = 332,878,240.09
  5. Step 5: Solve for x
    x = 332,878,240.09/20,945.39
  6. Step 6: Final answer
    x = 15,892.67

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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.