Home / 20,688.38-28,550.56-11,257.54

Finding the Fourth Proportional to 20,688.38, 28,550.56 and 11,257.54

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Solution

The fourth proportional to 20,688.38, 28,550.56 and 11,257.54 is: 15,535.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,688.38 : 28,550.56 = 11,257.54 : x
  2. Step 2: Convert to fraction form
    20,688.38/28,550.56 = 11,257.54/x
  3. Step 3: Cross multiply
    20,688.38x = 28,550.56 × 11,257.54
  4. Step 4: Simplify right side
    20,688.38x = 321,409,071.22
  5. Step 5: Solve for x
    x = 321,409,071.22/20,688.38
  6. Step 6: Final answer
    x = 15,535.73

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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.