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Finding the Fourth Proportional to 19,363.28, 28,998.84 and 11,138

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Solution

The fourth proportional to 19,363.28, 28,998.84 and 11,138 is: 16,680.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,363.28 : 28,998.84 = 11,138 : x
  2. Step 2: Convert to fraction form
    19,363.28/28,998.84 = 11,138/x
  3. Step 3: Cross multiply
    19,363.28x = 28,998.84 × 11,138
  4. Step 4: Simplify right side
    19,363.28x = 322,989,079.92
  5. Step 5: Solve for x
    x = 322,989,079.92/19,363.28
  6. Step 6: Final answer
    x = 16,680.49

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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.