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Finding the Fourth Proportional to 21,481.34, 29,644.47 and 11,921.40

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Solution

The fourth proportional to 21,481.34, 29,644.47 and 11,921.40 is: 16,451.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,481.34 : 29,644.47 = 11,921.40 : x
  2. Step 2: Convert to fraction form
    21,481.34/29,644.47 = 11,921.40/x
  3. Step 3: Cross multiply
    21,481.34x = 29,644.47 × 11,921.40
  4. Step 4: Simplify right side
    21,481.34x = 353,403,584.66
  5. Step 5: Solve for x
    x = 353,403,584.66/21,481.34
  6. Step 6: Final answer
    x = 16,451.66

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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.