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Finding the Fourth Proportional to 21,379, 29,503.21 and 11,818.74

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Solution

The fourth proportional to 21,379, 29,503.21 and 11,818.74 is: 16,309.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,379 : 29,503.21 = 11,818.74 : x
  2. Step 2: Convert to fraction form
    21,379/29,503.21 = 11,818.74/x
  3. Step 3: Cross multiply
    21,379x = 29,503.21 × 11,818.74
  4. Step 4: Simplify right side
    21,379x = 348,690,620.64
  5. Step 5: Solve for x
    x = 348,690,620.64/21,379
  6. Step 6: Final answer
    x = 16,309.96

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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.