Home / 13,420.40-20,131.66-3,559.68

Finding the Fourth Proportional to 13,420.40, 20,131.66 and 3,559.68

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Solution

The fourth proportional to 13,420.40, 20,131.66 and 3,559.68 is: 5,339.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,420.40 : 20,131.66 = 3,559.68 : x
  2. Step 2: Convert to fraction form
    13,420.40/20,131.66 = 3,559.68/x
  3. Step 3: Cross multiply
    13,420.40x = 20,131.66 × 3,559.68
  4. Step 4: Simplify right side
    13,420.40x = 71,662,258.57
  5. Step 5: Solve for x
    x = 71,662,258.57/13,420.40
  6. Step 6: Final answer
    x = 5,339.80

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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.