Home / 13,639.36-20,460.20-3,778.64

Finding the Fourth Proportional to 13,639.36, 20,460.20 and 3,778.64

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Solution

The fourth proportional to 13,639.36, 20,460.20 and 3,778.64 is: 5,668.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,639.36 : 20,460.20 = 3,778.64 : x
  2. Step 2: Convert to fraction form
    13,639.36/20,460.20 = 3,778.64/x
  3. Step 3: Cross multiply
    13,639.36x = 20,460.20 × 3,778.64
  4. Step 4: Simplify right side
    13,639.36x = 77,311,730.13
  5. Step 5: Solve for x
    x = 77,311,730.13/13,639.36
  6. Step 6: Final answer
    x = 5,668.28

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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.