Home / 13,278.20-19,919.70-6,687.80

Finding the Fourth Proportional to 13,278.20, 19,919.70 and 6,687.80

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Solution

The fourth proportional to 13,278.20, 19,919.70 and 6,687.80 is: 10,032.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,278.20 : 19,919.70 = 6,687.80 : x
  2. Step 2: Convert to fraction form
    13,278.20/19,919.70 = 6,687.80/x
  3. Step 3: Cross multiply
    13,278.20x = 19,919.70 × 6,687.80
  4. Step 4: Simplify right side
    13,278.20x = 133,218,969.66
  5. Step 5: Solve for x
    x = 133,218,969.66/13,278.20
  6. Step 6: Final answer
    x = 10,032.91

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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.