Home / 20,388.35-28,135.81-11,313.62

Finding the Fourth Proportional to 20,388.35, 28,135.81 and 11,313.62

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Solution

The fourth proportional to 20,388.35, 28,135.81 and 11,313.62 is: 15,612.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,388.35 : 28,135.81 = 11,313.62 : x
  2. Step 2: Convert to fraction form
    20,388.35/28,135.81 = 11,313.62/x
  3. Step 3: Cross multiply
    20,388.35x = 28,135.81 × 11,313.62
  4. Step 4: Simplify right side
    20,388.35x = 318,317,862.73
  5. Step 5: Solve for x
    x = 318,317,862.73/20,388.35
  6. Step 6: Final answer
    x = 15,612.73

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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.