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Finding the Fourth Proportional to 21,375.92, 29,485.68 and 13,809.98

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Solution

The fourth proportional to 21,375.92, 29,485.68 and 13,809.98 is: 19,049.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,375.92 : 29,485.68 = 13,809.98 : x
  2. Step 2: Convert to fraction form
    21,375.92/29,485.68 = 13,809.98/x
  3. Step 3: Cross multiply
    21,375.92x = 29,485.68 × 13,809.98
  4. Step 4: Simplify right side
    21,375.92x = 407,196,651.09
  5. Step 5: Solve for x
    x = 407,196,651.09/21,375.92
  6. Step 6: Final answer
    x = 19,049.32

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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.