Home / 20,688.68-28,550.19-11,257.25

Finding the Fourth Proportional to 20,688.68, 28,550.19 and 11,257.25

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Solution

The fourth proportional to 20,688.68, 28,550.19 and 11,257.25 is: 15,534.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,688.68 : 28,550.19 = 11,257.25 : x
  2. Step 2: Convert to fraction form
    20,688.68/28,550.19 = 11,257.25/x
  3. Step 3: Cross multiply
    20,688.68x = 28,550.19 × 11,257.25
  4. Step 4: Simplify right side
    20,688.68x = 321,396,483.63
  5. Step 5: Solve for x
    x = 321,396,483.63/20,688.68
  6. Step 6: Final answer
    x = 15,534.90

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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.