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Finding the Fourth Proportional to 21,679.86, 29,918.79 and 12,248.22

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Solution

The fourth proportional to 21,679.86, 29,918.79 and 12,248.22 is: 16,902.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,679.86 : 29,918.79 = 12,248.22 : x
  2. Step 2: Convert to fraction form
    21,679.86/29,918.79 = 12,248.22/x
  3. Step 3: Cross multiply
    21,679.86x = 29,918.79 × 12,248.22
  4. Step 4: Simplify right side
    21,679.86x = 366,451,922.05
  5. Step 5: Solve for x
    x = 366,451,922.05/21,679.86
  6. Step 6: Final answer
    x = 16,902.87

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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.