Home / 20,688.39-28,550.58-11,257.56

Finding the Fourth Proportional to 20,688.39, 28,550.58 and 11,257.56

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Solution

The fourth proportional to 20,688.39, 28,550.58 and 11,257.56 is: 15,535.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,688.39 : 28,550.58 = 11,257.56 : x
  2. Step 2: Convert to fraction form
    20,688.39/28,550.58 = 11,257.56/x
  3. Step 3: Cross multiply
    20,688.39x = 28,550.58 × 11,257.56
  4. Step 4: Simplify right side
    20,688.39x = 321,409,867.38
  5. Step 5: Solve for x
    x = 321,409,867.38/20,688.39
  6. Step 6: Final answer
    x = 15,535.76

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Double scale
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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.