Home / 21,142.20-29,169.66-12,188.56

Finding the Fourth Proportional to 21,142.20, 29,169.66 and 12,188.56

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Solution

The fourth proportional to 21,142.20, 29,169.66 and 12,188.56 is: 16,816.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,142.20 : 29,169.66 = 12,188.56 : x
  2. Step 2: Convert to fraction form
    21,142.20/29,169.66 = 12,188.56/x
  3. Step 3: Cross multiply
    21,142.20x = 29,169.66 × 12,188.56
  4. Step 4: Simplify right side
    21,142.20x = 355,536,078.17
  5. Step 5: Solve for x
    x = 355,536,078.17/21,142.20
  6. Step 6: Final answer
    x = 16,816.42

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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.