Home / 13,219.97-18,240.21-7,842.53

Finding the Fourth Proportional to 13,219.97, 18,240.21 and 7,842.53

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Solution

The fourth proportional to 13,219.97, 18,240.21 and 7,842.53 is: 10,820.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,219.97 : 18,240.21 = 7,842.53 : x
  2. Step 2: Convert to fraction form
    13,219.97/18,240.21 = 7,842.53/x
  3. Step 3: Cross multiply
    13,219.97x = 18,240.21 × 7,842.53
  4. Step 4: Simplify right side
    13,219.97x = 143,049,439.73
  5. Step 5: Solve for x
    x = 143,049,439.73/13,219.97
  6. Step 6: Final answer
    x = 10,820.71

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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.