Home / 20,403.87-28,157.31-11,451.54

Finding the Fourth Proportional to 20,403.87, 28,157.31 and 11,451.54

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Solution

The fourth proportional to 20,403.87, 28,157.31 and 11,451.54 is: 15,803.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,403.87 : 28,157.31 = 11,451.54 : x
  2. Step 2: Convert to fraction form
    20,403.87/28,157.31 = 11,451.54/x
  3. Step 3: Cross multiply
    20,403.87x = 28,157.31 × 11,451.54
  4. Step 4: Simplify right side
    20,403.87x = 322,444,561.76
  5. Step 5: Solve for x
    x = 322,444,561.76/20,403.87
  6. Step 6: Final answer
    x = 15,803.11

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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.