Home / 20,688.38-28,550.57-11,257.55

Finding the Fourth Proportional to 20,688.38, 28,550.57 and 11,257.55

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Solution

The fourth proportional to 20,688.38, 28,550.57 and 11,257.55 is: 15,535.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,688.38 : 28,550.57 = 11,257.55 : x
  2. Step 2: Convert to fraction form
    20,688.38/28,550.57 = 11,257.55/x
  3. Step 3: Cross multiply
    20,688.38x = 28,550.57 × 11,257.55
  4. Step 4: Simplify right side
    20,688.38x = 321,409,270.26
  5. Step 5: Solve for x
    x = 321,409,270.26/20,688.38
  6. Step 6: Final answer
    x = 15,535.74

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Half scale
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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.