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Finding the Fourth Proportional to 68,485.62, 102,745.02 and 21,738.90

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Solution

The fourth proportional to 68,485.62, 102,745.02 and 21,738.90 is: 32,613.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,485.62 : 102,745.02 = 21,738.90 : x
  2. Step 2: Convert to fraction form
    68,485.62/102,745.02 = 21,738.90/x
  3. Step 3: Cross multiply
    68,485.62x = 102,745.02 × 21,738.90
  4. Step 4: Simplify right side
    68,485.62x = 2,233,563,715.28
  5. Step 5: Solve for x
    x = 2,233,563,715.28/68,485.62
  6. Step 6: Final answer
    x = 32,613.62

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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.