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Finding the Fourth Proportional to 18,763, 28,146.12 and 4,912

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Solution

The fourth proportional to 18,763, 28,146.12 and 4,912 is: 7,368.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,763 : 28,146.12 = 4,912 : x
  2. Step 2: Convert to fraction form
    18,763/28,146.12 = 4,912/x
  3. Step 3: Cross multiply
    18,763x = 28,146.12 × 4,912
  4. Step 4: Simplify right side
    18,763x = 138,253,741.44
  5. Step 5: Solve for x
    x = 138,253,741.44/18,763
  6. Step 6: Final answer
    x = 7,368.42

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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.