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Finding the Fourth Proportional to 18,812.96, 28,223.44 and 7,125.92

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Solution

The fourth proportional to 18,812.96, 28,223.44 and 7,125.92 is: 10,690.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,812.96 : 28,223.44 = 7,125.92 : x
  2. Step 2: Convert to fraction form
    18,812.96/28,223.44 = 7,125.92/x
  3. Step 3: Cross multiply
    18,812.96x = 28,223.44 × 7,125.92
  4. Step 4: Simplify right side
    18,812.96x = 201,117,975.56
  5. Step 5: Solve for x
    x = 201,117,975.56/18,812.96
  6. Step 6: Final answer
    x = 10,690.40

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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.