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Finding the Fourth Proportional to 21,720.94, 29,974.89 and 11,784.94

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Solution

The fourth proportional to 21,720.94, 29,974.89 and 11,784.94 is: 16,263.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,720.94 : 29,974.89 = 11,784.94 : x
  2. Step 2: Convert to fraction form
    21,720.94/29,974.89 = 11,784.94/x
  3. Step 3: Cross multiply
    21,720.94x = 29,974.89 × 11,784.94
  4. Step 4: Simplify right side
    21,720.94x = 353,252,249.41
  5. Step 5: Solve for x
    x = 353,252,249.41/21,720.94
  6. Step 6: Final answer
    x = 16,263.21

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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.