Home / 13,781.85-20,669.65-3,920.91

Finding the Fourth Proportional to 13,781.85, 20,669.65 and 3,920.91

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Solution

The fourth proportional to 13,781.85, 20,669.65 and 3,920.91 is: 5,880.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,781.85 : 20,669.65 = 3,920.91 : x
  2. Step 2: Convert to fraction form
    13,781.85/20,669.65 = 3,920.91/x
  3. Step 3: Cross multiply
    13,781.85x = 20,669.65 × 3,920.91
  4. Step 4: Simplify right side
    13,781.85x = 81,043,837.38
  5. Step 5: Solve for x
    x = 81,043,837.38/13,781.85
  6. Step 6: Final answer
    x = 5,880.48

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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.