Home / 20,138.48-30,208.08-6,991.28

Finding the Fourth Proportional to 20,138.48, 30,208.08 and 6,991.28

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Solution

The fourth proportional to 20,138.48, 30,208.08 and 6,991.28 is: 10,487.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,138.48 : 30,208.08 = 6,991.28 : x
  2. Step 2: Convert to fraction form
    20,138.48/30,208.08 = 6,991.28/x
  3. Step 3: Cross multiply
    20,138.48x = 30,208.08 × 6,991.28
  4. Step 4: Simplify right side
    20,138.48x = 211,193,145.54
  5. Step 5: Solve for x
    x = 211,193,145.54/20,138.48
  6. Step 6: Final answer
    x = 10,487.04

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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.