Home / 13,421.35-20,139.94-5,108.36

Finding the Fourth Proportional to 13,421.35, 20,139.94 and 5,108.36

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Solution

The fourth proportional to 13,421.35, 20,139.94 and 5,108.36 is: 7,665.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,421.35 : 20,139.94 = 5,108.36 : x
  2. Step 2: Convert to fraction form
    13,421.35/20,139.94 = 5,108.36/x
  3. Step 3: Cross multiply
    13,421.35x = 20,139.94 × 5,108.36
  4. Step 4: Simplify right side
    13,421.35x = 102,882,063.90
  5. Step 5: Solve for x
    x = 102,882,063.90/13,421.35
  6. Step 6: Final answer
    x = 7,665.56

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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.