Home / 21,120.26-29,144.94-11,688.62

Finding the Fourth Proportional to 21,120.26, 29,144.94 and 11,688.62

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Solution

The fourth proportional to 21,120.26, 29,144.94 and 11,688.62 is: 16,129.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,120.26 : 29,144.94 = 11,688.62 : x
  2. Step 2: Convert to fraction form
    21,120.26/29,144.94 = 11,688.62/x
  3. Step 3: Cross multiply
    21,120.26x = 29,144.94 × 11,688.62
  4. Step 4: Simplify right side
    21,120.26x = 340,664,128.58
  5. Step 5: Solve for x
    x = 340,664,128.58/21,120.26
  6. Step 6: Final answer
    x = 16,129.73

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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.