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Finding the Fourth Proportional to 68,765.66, 103,131.78 and 28,763

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Solution

The fourth proportional to 68,765.66, 103,131.78 and 28,763 is: 43,137.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,765.66 : 103,131.78 = 28,763 : x
  2. Step 2: Convert to fraction form
    68,765.66/103,131.78 = 28,763/x
  3. Step 3: Cross multiply
    68,765.66x = 103,131.78 × 28,763
  4. Step 4: Simplify right side
    68,765.66x = 2,966,379,388.14
  5. Step 5: Solve for x
    x = 2,966,379,388.14/68,765.66
  6. Step 6: Final answer
    x = 43,137.51

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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.