Home / 20,388.14-28,135.87-11,313.69

Finding the Fourth Proportional to 20,388.14, 28,135.87 and 11,313.69

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Solution

The fourth proportional to 20,388.14, 28,135.87 and 11,313.69 is: 15,613.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,388.14 : 28,135.87 = 11,313.69 : x
  2. Step 2: Convert to fraction form
    20,388.14/28,135.87 = 11,313.69/x
  3. Step 3: Cross multiply
    20,388.14x = 28,135.87 × 11,313.69
  4. Step 4: Simplify right side
    20,388.14x = 318,320,377.27
  5. Step 5: Solve for x
    x = 318,320,377.27/20,388.14
  6. Step 6: Final answer
    x = 15,613.02

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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.