Home / 12,139.85-18,212.27-5,119.87

Finding the Fourth Proportional to 12,139.85, 18,212.27 and 5,119.87

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Solution

The fourth proportional to 12,139.85, 18,212.27 and 5,119.87 is: 7,680.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,139.85 : 18,212.27 = 5,119.87 : x
  2. Step 2: Convert to fraction form
    12,139.85/18,212.27 = 5,119.87/x
  3. Step 3: Cross multiply
    12,139.85x = 18,212.27 × 5,119.87
  4. Step 4: Simplify right side
    12,139.85x = 93,244,416.41
  5. Step 5: Solve for x
    x = 93,244,416.41/12,139.85
  6. Step 6: Final answer
    x = 7,680.85

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1.5x scale

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.