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Finding the Fourth Proportional to 21,679.22, 29,917.41 and 13,295.54

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Solution

The fourth proportional to 21,679.22, 29,917.41 and 13,295.54 is: 18,347.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,679.22 : 29,917.41 = 13,295.54 : x
  2. Step 2: Convert to fraction form
    21,679.22/29,917.41 = 13,295.54/x
  3. Step 3: Cross multiply
    21,679.22x = 29,917.41 × 13,295.54
  4. Step 4: Simplify right side
    21,679.22x = 397,768,121.35
  5. Step 5: Solve for x
    x = 397,768,121.35/21,679.22
  6. Step 6: Final answer
    x = 18,347.90

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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.