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Finding the Fourth Proportional to 13,420.99, 20,131.49 and 3,560.68

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Solution

The fourth proportional to 13,420.99, 20,131.49 and 3,560.68 is: 5,341.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,420.99 : 20,131.49 = 3,560.68 : x
  2. Step 2: Convert to fraction form
    13,420.99/20,131.49 = 3,560.68/x
  3. Step 3: Cross multiply
    13,420.99x = 20,131.49 × 3,560.68
  4. Step 4: Simplify right side
    13,420.99x = 71,681,793.81
  5. Step 5: Solve for x
    x = 71,681,793.81/13,420.99
  6. Step 6: Final answer
    x = 5,341.02

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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.