Home / 21,120.67-29,146.39-12,169.90

Finding the Fourth Proportional to 21,120.67, 29,146.39 and 12,169.90

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Solution

The fourth proportional to 21,120.67, 29,146.39 and 12,169.90 is: 16,794.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,120.67 : 29,146.39 = 12,169.90 : x
  2. Step 2: Convert to fraction form
    21,120.67/29,146.39 = 12,169.90/x
  3. Step 3: Cross multiply
    21,120.67x = 29,146.39 × 12,169.90
  4. Step 4: Simplify right side
    21,120.67x = 354,708,651.66
  5. Step 5: Solve for x
    x = 354,708,651.66/21,120.67
  6. Step 6: Final answer
    x = 16,794.38

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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.