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Finding the Fourth Proportional to 13,420.77, 20,133.90 and 5,099.22

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Solution

The fourth proportional to 13,420.77, 20,133.90 and 5,099.22 is: 7,649.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,420.77 : 20,133.90 = 5,099.22 : x
  2. Step 2: Convert to fraction form
    13,420.77/20,133.90 = 5,099.22/x
  3. Step 3: Cross multiply
    13,420.77x = 20,133.90 × 5,099.22
  4. Step 4: Simplify right side
    13,420.77x = 102,667,185.56
  5. Step 5: Solve for x
    x = 102,667,185.56/13,420.77
  6. Step 6: Final answer
    x = 7,649.87

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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.