Home / 12,415.80-17,128.62-8,216.76

Finding the Fourth Proportional to 12,415.80, 17,128.62 and 8,216.76

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Solution

The fourth proportional to 12,415.80, 17,128.62 and 8,216.76 is: 11,335.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,415.80 : 17,128.62 = 8,216.76 : x
  2. Step 2: Convert to fraction form
    12,415.80/17,128.62 = 8,216.76/x
  3. Step 3: Cross multiply
    12,415.80x = 17,128.62 × 8,216.76
  4. Step 4: Simplify right side
    12,415.80x = 140,741,759.67
  5. Step 5: Solve for x
    x = 140,741,759.67/12,415.80
  6. Step 6: Final answer
    x = 11,335.70

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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.