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Finding the Fourth Proportional to 68,269, 102,420.78 and 19,021

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Solution

The fourth proportional to 68,269, 102,420.78 and 19,021 is: 28,536.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,269 : 102,420.78 = 19,021 : x
  2. Step 2: Convert to fraction form
    68,269/102,420.78 = 19,021/x
  3. Step 3: Cross multiply
    68,269x = 102,420.78 × 19,021
  4. Step 4: Simplify right side
    68,269x = 1,948,145,656.38
  5. Step 5: Solve for x
    x = 1,948,145,656.38/68,269
  6. Step 6: Final answer
    x = 28,536.31

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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.