Home / 13,412.26-20,105.34-6,390.40

Finding the Fourth Proportional to 13,412.26, 20,105.34 and 6,390.40

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Solution

The fourth proportional to 13,412.26, 20,105.34 and 6,390.40 is: 9,579.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,412.26 : 20,105.34 = 6,390.40 : x
  2. Step 2: Convert to fraction form
    13,412.26/20,105.34 = 6,390.40/x
  3. Step 3: Cross multiply
    13,412.26x = 20,105.34 × 6,390.40
  4. Step 4: Simplify right side
    13,412.26x = 128,481,164.74
  5. Step 5: Solve for x
    x = 128,481,164.74/13,412.26
  6. Step 6: Final answer
    x = 9,579.38

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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.