Home / 15,015.87-20,720.21-8,299.80

Finding the Fourth Proportional to 15,015.87, 20,720.21 and 8,299.80

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Solution

The fourth proportional to 15,015.87, 20,720.21 and 8,299.80 is: 11,452.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,015.87 : 20,720.21 = 8,299.80 : x
  2. Step 2: Convert to fraction form
    15,015.87/20,720.21 = 8,299.80/x
  3. Step 3: Cross multiply
    15,015.87x = 20,720.21 × 8,299.80
  4. Step 4: Simplify right side
    15,015.87x = 171,973,557.46
  5. Step 5: Solve for x
    x = 171,973,557.46/15,015.87
  6. Step 6: Final answer
    x = 11,452.79

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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.