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Finding the Fourth Proportional to 21,311, 29,409.20 and 11,879.56

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Solution

The fourth proportional to 21,311, 29,409.20 and 11,879.56 is: 16,393.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,311 : 29,409.20 = 11,879.56 : x
  2. Step 2: Convert to fraction form
    21,311/29,409.20 = 11,879.56/x
  3. Step 3: Cross multiply
    21,311x = 29,409.20 × 11,879.56
  4. Step 4: Simplify right side
    21,311x = 349,368,355.95
  5. Step 5: Solve for x
    x = 349,368,355.95/21,311
  6. Step 6: Final answer
    x = 16,393.80

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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.