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Finding the Fourth Proportional to 18,811.92, 28,218.84 and 7,126.08

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Solution

The fourth proportional to 18,811.92, 28,218.84 and 7,126.08 is: 10,689.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,811.92 : 28,218.84 = 7,126.08 : x
  2. Step 2: Convert to fraction form
    18,811.92/28,218.84 = 7,126.08/x
  3. Step 3: Cross multiply
    18,811.92x = 28,218.84 × 7,126.08
  4. Step 4: Simplify right side
    18,811.92x = 201,089,711.35
  5. Step 5: Solve for x
    x = 201,089,711.35/18,811.92
  6. Step 6: Final answer
    x = 10,689.48

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1.5x scale

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.