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Finding the Fourth Proportional to 19,279.94, 28,919.90 and 5,428.94

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Solution

The fourth proportional to 19,279.94, 28,919.90 and 5,428.94 is: 8,143.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,279.94 : 28,919.90 = 5,428.94 : x
  2. Step 2: Convert to fraction form
    19,279.94/28,919.90 = 5,428.94/x
  3. Step 3: Cross multiply
    19,279.94x = 28,919.90 × 5,428.94
  4. Step 4: Simplify right side
    19,279.94x = 157,004,401.91
  5. Step 5: Solve for x
    x = 157,004,401.91/19,279.94
  6. Step 6: Final answer
    x = 8,143.41

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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.