Home / 13,147.36-18,138.17-8,102.80

Finding the Fourth Proportional to 13,147.36, 18,138.17 and 8,102.80

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Solution

The fourth proportional to 13,147.36, 18,138.17 and 8,102.80 is: 11,178.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,147.36 : 18,138.17 = 8,102.80 : x
  2. Step 2: Convert to fraction form
    13,147.36/18,138.17 = 8,102.80/x
  3. Step 3: Cross multiply
    13,147.36x = 18,138.17 × 8,102.80
  4. Step 4: Simplify right side
    13,147.36x = 146,969,963.88
  5. Step 5: Solve for x
    x = 146,969,963.88/13,147.36
  6. Step 6: Final answer
    x = 11,178.67

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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.