Home / 20,911.21-28,847.84-13,353.76

Finding the Fourth Proportional to 20,911.21, 28,847.84 and 13,353.76

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Solution

The fourth proportional to 20,911.21, 28,847.84 and 13,353.76 is: 18,422.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,911.21 : 28,847.84 = 13,353.76 : x
  2. Step 2: Convert to fraction form
    20,911.21/28,847.84 = 13,353.76/x
  3. Step 3: Cross multiply
    20,911.21x = 28,847.84 × 13,353.76
  4. Step 4: Simplify right side
    20,911.21x = 385,227,131.88
  5. Step 5: Solve for x
    x = 385,227,131.88/20,911.21
  6. Step 6: Final answer
    x = 18,422.04

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.