Home / 21,105.90-29,121.93-11,672.64

Finding the Fourth Proportional to 21,105.90, 29,121.93 and 11,672.64

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Solution

The fourth proportional to 21,105.90, 29,121.93 and 11,672.64 is: 16,105.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,105.90 : 29,121.93 = 11,672.64 : x
  2. Step 2: Convert to fraction form
    21,105.90/29,121.93 = 11,672.64/x
  3. Step 3: Cross multiply
    21,105.90x = 29,121.93 × 11,672.64
  4. Step 4: Simplify right side
    21,105.90x = 339,929,805.00
  5. Step 5: Solve for x
    x = 339,929,805.00/21,105.90
  6. Step 6: Final answer
    x = 16,105.91

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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.