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Finding the Fourth Proportional to 21,999.87, 30,359.72 and 11,928.28

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Solution

The fourth proportional to 21,999.87, 30,359.72 and 11,928.28 is: 16,460.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,999.87 : 30,359.72 = 11,928.28 : x
  2. Step 2: Convert to fraction form
    21,999.87/30,359.72 = 11,928.28/x
  3. Step 3: Cross multiply
    21,999.87x = 30,359.72 × 11,928.28
  4. Step 4: Simplify right side
    21,999.87x = 362,139,240.88
  5. Step 5: Solve for x
    x = 362,139,240.88/21,999.87
  6. Step 6: Final answer
    x = 16,460.97

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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.