Home / 20,759.20-31,138.80-20,629.60

Finding the Fourth Proportional to 20,759.20, 31,138.80 and 20,629.60

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Solution

The fourth proportional to 20,759.20, 31,138.80 and 20,629.60 is: 30,944.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,759.20 : 31,138.80 = 20,629.60 : x
  2. Step 2: Convert to fraction form
    20,759.20/31,138.80 = 20,629.60/x
  3. Step 3: Cross multiply
    20,759.20x = 31,138.80 × 20,629.60
  4. Step 4: Simplify right side
    20,759.20x = 642,380,988.48
  5. Step 5: Solve for x
    x = 642,380,988.48/20,759.20
  6. Step 6: Final answer
    x = 30,944.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.