Home / 13,420.20-18,517.14-8,115.30

Finding the Fourth Proportional to 13,420.20, 18,517.14 and 8,115.30

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Solution

The fourth proportional to 13,420.20, 18,517.14 and 8,115.30 is: 11,197.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,420.20 : 18,517.14 = 8,115.30 : x
  2. Step 2: Convert to fraction form
    13,420.20/18,517.14 = 8,115.30/x
  3. Step 3: Cross multiply
    13,420.20x = 18,517.14 × 8,115.30
  4. Step 4: Simplify right side
    13,420.20x = 150,272,146.24
  5. Step 5: Solve for x
    x = 150,272,146.24/13,420.20
  6. Step 6: Final answer
    x = 11,197.46

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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.