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Finding the Fourth Proportional to 20,643.93, 30,965.72 and 12,268.48

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Solution

The fourth proportional to 20,643.93, 30,965.72 and 12,268.48 is: 18,402.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,643.93 : 30,965.72 = 12,268.48 : x
  2. Step 2: Convert to fraction form
    20,643.93/30,965.72 = 12,268.48/x
  3. Step 3: Cross multiply
    20,643.93x = 30,965.72 × 12,268.48
  4. Step 4: Simplify right side
    20,643.93x = 379,902,269.76
  5. Step 5: Solve for x
    x = 379,902,269.76/20,643.93
  6. Step 6: Final answer
    x = 18,402.61

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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.