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Finding the Fourth Proportional to 21,999.84, 30,359.91 and 11,928.42

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Solution

The fourth proportional to 21,999.84, 30,359.91 and 11,928.42 is: 16,461.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,999.84 : 30,359.91 = 11,928.42 : x
  2. Step 2: Convert to fraction form
    21,999.84/30,359.91 = 11,928.42/x
  3. Step 3: Cross multiply
    21,999.84x = 30,359.91 × 11,928.42
  4. Step 4: Simplify right side
    21,999.84x = 362,145,757.64
  5. Step 5: Solve for x
    x = 362,145,757.64/21,999.84
  6. Step 6: Final answer
    x = 16,461.29

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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.