Home / 13,420.21-20,130.32-4,186.21

Finding the Fourth Proportional to 13,420.21, 20,130.32 and 4,186.21

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Solution

The fourth proportional to 13,420.21, 20,130.32 and 4,186.21 is: 6,279.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,420.21 : 20,130.32 = 4,186.21 : x
  2. Step 2: Convert to fraction form
    13,420.21/20,130.32 = 4,186.21/x
  3. Step 3: Cross multiply
    13,420.21x = 20,130.32 × 4,186.21
  4. Step 4: Simplify right side
    13,420.21x = 84,269,815.54
  5. Step 5: Solve for x
    x = 84,269,815.54/13,420.21
  6. Step 6: Final answer
    x = 6,279.32

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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.