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Finding the Fourth Proportional to 21,471.71, 29,629.44 and 11,912.09

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Solution

The fourth proportional to 21,471.71, 29,629.44 and 11,912.09 is: 16,437.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,471.71 : 29,629.44 = 11,912.09 : x
  2. Step 2: Convert to fraction form
    21,471.71/29,629.44 = 11,912.09/x
  3. Step 3: Cross multiply
    21,471.71x = 29,629.44 × 11,912.09
  4. Step 4: Simplify right side
    21,471.71x = 352,948,407.78
  5. Step 5: Solve for x
    x = 352,948,407.78/21,471.71
  6. Step 6: Final answer
    x = 16,437.84

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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.