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Finding the Fourth Proportional to 21,178.67, 29,221.85 and 12,224.27

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Solution

The fourth proportional to 21,178.67, 29,221.85 and 12,224.27 is: 16,866.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,178.67 : 29,221.85 = 12,224.27 : x
  2. Step 2: Convert to fraction form
    21,178.67/29,221.85 = 12,224.27/x
  3. Step 3: Cross multiply
    21,178.67x = 29,221.85 × 12,224.27
  4. Step 4: Simplify right side
    21,178.67x = 357,215,887.91
  5. Step 5: Solve for x
    x = 357,215,887.91/21,178.67
  6. Step 6: Final answer
    x = 16,866.78

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.