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Finding the Fourth Proportional to 18,940.78, 28,411.16 and 5,089.78

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Solution

The fourth proportional to 18,940.78, 28,411.16 and 5,089.78 is: 7,634.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,940.78 : 28,411.16 = 5,089.78 : x
  2. Step 2: Convert to fraction form
    18,940.78/28,411.16 = 5,089.78/x
  3. Step 3: Cross multiply
    18,940.78x = 28,411.16 × 5,089.78
  4. Step 4: Simplify right side
    18,940.78x = 144,606,553.94
  5. Step 5: Solve for x
    x = 144,606,553.94/18,940.78
  6. Step 6: Final answer
    x = 7,634.67

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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.