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Finding the Fourth Proportional to 68,739.60, 103,109.32 and 18,820.08

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Solution

The fourth proportional to 68,739.60, 103,109.32 and 18,820.08 is: 28,230.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,739.60 : 103,109.32 = 18,820.08 : x
  2. Step 2: Convert to fraction form
    68,739.60/103,109.32 = 18,820.08/x
  3. Step 3: Cross multiply
    68,739.60x = 103,109.32 × 18,820.08
  4. Step 4: Simplify right side
    68,739.60x = 1,940,525,651.15
  5. Step 5: Solve for x
    x = 1,940,525,651.15/68,739.60
  6. Step 6: Final answer
    x = 28,230.10

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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.