Home / 12,820.39-17,694.40-8,288.65

Finding the Fourth Proportional to 12,820.39, 17,694.40 and 8,288.65

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Solution

The fourth proportional to 12,820.39, 17,694.40 and 8,288.65 is: 11,439.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,820.39 : 17,694.40 = 8,288.65 : x
  2. Step 2: Convert to fraction form
    12,820.39/17,694.40 = 8,288.65/x
  3. Step 3: Cross multiply
    12,820.39x = 17,694.40 × 8,288.65
  4. Step 4: Simplify right side
    12,820.39x = 146,662,605.97
  5. Step 5: Solve for x
    x = 146,662,605.97/12,820.39
  6. Step 6: Final answer
    x = 11,439.79

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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.