Home / 20,945.92-28,905.96-11,515.12

Finding the Fourth Proportional to 20,945.92, 28,905.96 and 11,515.12

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Solution

The fourth proportional to 20,945.92, 28,905.96 and 11,515.12 is: 15,891.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,945.92 : 28,905.96 = 11,515.12 : x
  2. Step 2: Convert to fraction form
    20,945.92/28,905.96 = 11,515.12/x
  3. Step 3: Cross multiply
    20,945.92x = 28,905.96 × 11,515.12
  4. Step 4: Simplify right side
    20,945.92x = 332,855,598.12
  5. Step 5: Solve for x
    x = 332,855,598.12/20,945.92
  6. Step 6: Final answer
    x = 15,891.19

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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.