Home / 13,424.40-20,128.59-5,520.78

Finding the Fourth Proportional to 13,424.40, 20,128.59 and 5,520.78

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Solution

The fourth proportional to 13,424.40, 20,128.59 and 5,520.78 is: 8,277.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,424.40 : 20,128.59 = 5,520.78 : x
  2. Step 2: Convert to fraction form
    13,424.40/20,128.59 = 5,520.78/x
  3. Step 3: Cross multiply
    13,424.40x = 20,128.59 × 5,520.78
  4. Step 4: Simplify right side
    13,424.40x = 111,125,517.10
  5. Step 5: Solve for x
    x = 111,125,517.10/13,424.40
  6. Step 6: Final answer
    x = 8,277.88

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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.