Home / 12,489.45-18,733.74-3,129.55

Finding the Fourth Proportional to 12,489.45, 18,733.74 and 3,129.55

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Solution

The fourth proportional to 12,489.45, 18,733.74 and 3,129.55 is: 4,694.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,489.45 : 18,733.74 = 3,129.55 : x
  2. Step 2: Convert to fraction form
    12,489.45/18,733.74 = 3,129.55/x
  3. Step 3: Cross multiply
    12,489.45x = 18,733.74 × 3,129.55
  4. Step 4: Simplify right side
    12,489.45x = 58,628,199.43
  5. Step 5: Solve for x
    x = 58,628,199.43/12,489.45
  6. Step 6: Final answer
    x = 4,694.22

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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.