Home / 13,781.28-20,671.68-3,920.64

Finding the Fourth Proportional to 13,781.28, 20,671.68 and 3,920.64

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Solution

The fourth proportional to 13,781.28, 20,671.68 and 3,920.64 is: 5,880.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,781.28 : 20,671.68 = 3,920.64 : x
  2. Step 2: Convert to fraction form
    13,781.28/20,671.68 = 3,920.64/x
  3. Step 3: Cross multiply
    13,781.28x = 20,671.68 × 3,920.64
  4. Step 4: Simplify right side
    13,781.28x = 81,046,215.48
  5. Step 5: Solve for x
    x = 81,046,215.48/13,781.28
  6. Step 6: Final answer
    x = 5,880.89

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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.