Home / 12,515.28-18,761.92-5,120.80

Finding the Fourth Proportional to 12,515.28, 18,761.92 and 5,120.80

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Solution

The fourth proportional to 12,515.28, 18,761.92 and 5,120.80 is: 7,676.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,515.28 : 18,761.92 = 5,120.80 : x
  2. Step 2: Convert to fraction form
    12,515.28/18,761.92 = 5,120.80/x
  3. Step 3: Cross multiply
    12,515.28x = 18,761.92 × 5,120.80
  4. Step 4: Simplify right side
    12,515.28x = 96,076,039.94
  5. Step 5: Solve for x
    x = 96,076,039.94/12,515.28
  6. Step 6: Final answer
    x = 7,676.70

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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.