Home / 12,639.84-17,439.48-8,163.78

Finding the Fourth Proportional to 12,639.84, 17,439.48 and 8,163.78

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Solution

The fourth proportional to 12,639.84, 17,439.48 and 8,163.78 is: 11,263.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,639.84 : 17,439.48 = 8,163.78 : x
  2. Step 2: Convert to fraction form
    12,639.84/17,439.48 = 8,163.78/x
  3. Step 3: Cross multiply
    12,639.84x = 17,439.48 × 8,163.78
  4. Step 4: Simplify right side
    12,639.84x = 142,372,078.03
  5. Step 5: Solve for x
    x = 142,372,078.03/12,639.84
  6. Step 6: Final answer
    x = 11,263.76

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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.