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Finding the Fourth Proportional to 18,685.59, 25,771.52 and 11,971.84

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Solution

The fourth proportional to 18,685.59, 25,771.52 and 11,971.84 is: 16,511.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,685.59 : 25,771.52 = 11,971.84 : x
  2. Step 2: Convert to fraction form
    18,685.59/25,771.52 = 11,971.84/x
  3. Step 3: Cross multiply
    18,685.59x = 25,771.52 × 11,971.84
  4. Step 4: Simplify right side
    18,685.59x = 308,532,527.82
  5. Step 5: Solve for x
    x = 308,532,527.82/18,685.59
  6. Step 6: Final answer
    x = 16,511.79

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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.