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Finding the Fourth Proportional to 21,863.93, 32,811.84 and 8,720.06

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Solution

The fourth proportional to 21,863.93, 32,811.84 and 8,720.06 is: 13,086.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,863.93 : 32,811.84 = 8,720.06 : x
  2. Step 2: Convert to fraction form
    21,863.93/32,811.84 = 8,720.06/x
  3. Step 3: Cross multiply
    21,863.93x = 32,811.84 × 8,720.06
  4. Step 4: Simplify right side
    21,863.93x = 286,121,049.45
  5. Step 5: Solve for x
    x = 286,121,049.45/21,863.93
  6. Step 6: Final answer
    x = 13,086.44

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.