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Finding the Fourth Proportional to 21,656, 29,885.30 and 11,720

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Solution

The fourth proportional to 21,656, 29,885.30 and 11,720 is: 16,173.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,656 : 29,885.30 = 11,720 : x
  2. Step 2: Convert to fraction form
    21,656/29,885.30 = 11,720/x
  3. Step 3: Cross multiply
    21,656x = 29,885.30 × 11,720
  4. Step 4: Simplify right side
    21,656x = 350,255,716
  5. Step 5: Solve for x
    x = 350,255,716/21,656
  6. Step 6: Final answer
    x = 16,173.61

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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.