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Finding the Fourth Proportional to 68,919.79, 103,420.31 and 28,945.79

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Solution

The fourth proportional to 68,919.79, 103,420.31 and 28,945.79 is: 43,435.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,919.79 : 103,420.31 = 28,945.79 : x
  2. Step 2: Convert to fraction form
    68,919.79/103,420.31 = 28,945.79/x
  3. Step 3: Cross multiply
    68,919.79x = 103,420.31 × 28,945.79
  4. Step 4: Simplify right side
    68,919.79x = 2,993,582,574.99
  5. Step 5: Solve for x
    x = 2,993,582,574.99/68,919.79
  6. Step 6: Final answer
    x = 43,435.75

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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.