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Finding the Fourth Proportional to 18,912.68, 28,363.80 and 10,015.94

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Solution

The fourth proportional to 18,912.68, 28,363.80 and 10,015.94 is: 15,021.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,912.68 : 28,363.80 = 10,015.94 : x
  2. Step 2: Convert to fraction form
    18,912.68/28,363.80 = 10,015.94/x
  3. Step 3: Cross multiply
    18,912.68x = 28,363.80 × 10,015.94
  4. Step 4: Simplify right side
    18,912.68x = 284,090,118.97
  5. Step 5: Solve for x
    x = 284,090,118.97/18,912.68
  6. Step 6: Final answer
    x = 15,021.15

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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.