Home / 20,445.87-28,212.86-11,368.97

Finding the Fourth Proportional to 20,445.87, 28,212.86 and 11,368.97

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Solution

The fourth proportional to 20,445.87, 28,212.86 and 11,368.97 is: 15,687.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,445.87 : 28,212.86 = 11,368.97 : x
  2. Step 2: Convert to fraction form
    20,445.87/28,212.86 = 11,368.97/x
  3. Step 3: Cross multiply
    20,445.87x = 28,212.86 × 11,368.97
  4. Step 4: Simplify right side
    20,445.87x = 320,750,961.05
  5. Step 5: Solve for x
    x = 320,750,961.05/20,445.87
  6. Step 6: Final answer
    x = 15,687.81

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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.