Home / 20,631.75-28,471.75-11,200.25

Finding the Fourth Proportional to 20,631.75, 28,471.75 and 11,200.25

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Solution

The fourth proportional to 20,631.75, 28,471.75 and 11,200.25 is: 15,456.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,631.75 : 28,471.75 = 11,200.25 : x
  2. Step 2: Convert to fraction form
    20,631.75/28,471.75 = 11,200.25/x
  3. Step 3: Cross multiply
    20,631.75x = 28,471.75 × 11,200.25
  4. Step 4: Simplify right side
    20,631.75x = 318,890,519.58
  5. Step 5: Solve for x
    x = 318,890,519.58/20,631.75
  6. Step 6: Final answer
    x = 15,456.30

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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.