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Finding the Fourth Proportional to 21,060.80, 29,064.12 and 11,628.08

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Solution

The fourth proportional to 21,060.80, 29,064.12 and 11,628.08 is: 16,046.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,060.80 : 29,064.12 = 11,628.08 : x
  2. Step 2: Convert to fraction form
    21,060.80/29,064.12 = 11,628.08/x
  3. Step 3: Cross multiply
    21,060.80x = 29,064.12 × 11,628.08
  4. Step 4: Simplify right side
    21,060.80x = 337,959,912.49
  5. Step 5: Solve for x
    x = 337,959,912.49/21,060.80
  6. Step 6: Final answer
    x = 16,046.87

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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.