Home / 13,620.78-20,432.16-3,759.30

Finding the Fourth Proportional to 13,620.78, 20,432.16 and 3,759.30

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Solution

The fourth proportional to 13,620.78, 20,432.16 and 3,759.30 is: 5,639.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,620.78 : 20,432.16 = 3,759.30 : x
  2. Step 2: Convert to fraction form
    13,620.78/20,432.16 = 3,759.30/x
  3. Step 3: Cross multiply
    13,620.78x = 20,432.16 × 3,759.30
  4. Step 4: Simplify right side
    13,620.78x = 76,810,619.09
  5. Step 5: Solve for x
    x = 76,810,619.09/13,620.78
  6. Step 6: Final answer
    x = 5,639.22

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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.