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Finding the Fourth Proportional to 18,685.92, 25,771.98 and 11,972.16

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Solution

The fourth proportional to 18,685.92, 25,771.98 and 11,972.16 is: 16,512.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,685.92 : 25,771.98 = 11,972.16 : x
  2. Step 2: Convert to fraction form
    18,685.92/25,771.98 = 11,972.16/x
  3. Step 3: Cross multiply
    18,685.92x = 25,771.98 × 11,972.16
  4. Step 4: Simplify right side
    18,685.92x = 308,546,268.08
  5. Step 5: Solve for x
    x = 308,546,268.08/18,685.92
  6. Step 6: Final answer
    x = 16,512.23

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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.