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Finding the Fourth Proportional to 18,912, 28,368 and 5,764.26

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Solution

The fourth proportional to 18,912, 28,368 and 5,764.26 is: 8,646.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,912 : 28,368 = 5,764.26 : x
  2. Step 2: Convert to fraction form
    18,912/28,368 = 5,764.26/x
  3. Step 3: Cross multiply
    18,912x = 28,368 × 5,764.26
  4. Step 4: Simplify right side
    18,912x = 163,520,527.68
  5. Step 5: Solve for x
    x = 163,520,527.68/18,912
  6. Step 6: Final answer
    x = 8,646.39

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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.