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Finding the Fourth Proportional to 21,678.86, 29,917.42 and 12,247.22

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Solution

The fourth proportional to 21,678.86, 29,917.42 and 12,247.22 is: 16,901.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,678.86 : 29,917.42 = 12,247.22 : x
  2. Step 2: Convert to fraction form
    21,678.86/29,917.42 = 12,247.22/x
  3. Step 3: Cross multiply
    21,678.86x = 29,917.42 × 12,247.22
  4. Step 4: Simplify right side
    21,678.86x = 366,405,224.57
  5. Step 5: Solve for x
    x = 366,405,224.57/21,678.86
  6. Step 6: Final answer
    x = 16,901.50

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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.