Home / 13,680.28-20,521.64-3,820.15

Finding the Fourth Proportional to 13,680.28, 20,521.64 and 3,820.15

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Solution

The fourth proportional to 13,680.28, 20,521.64 and 3,820.15 is: 5,730.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,680.28 : 20,521.64 = 3,820.15 : x
  2. Step 2: Convert to fraction form
    13,680.28/20,521.64 = 3,820.15/x
  3. Step 3: Cross multiply
    13,680.28x = 20,521.64 × 3,820.15
  4. Step 4: Simplify right side
    13,680.28x = 78,395,743.05
  5. Step 5: Solve for x
    x = 78,395,743.05/13,680.28
  6. Step 6: Final answer
    x = 5,730.57

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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.