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Finding the Fourth Proportional to 68,904.65, 103,350.90 and 18,980.30

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Solution

The fourth proportional to 68,904.65, 103,350.90 and 18,980.30 is: 28,468.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,904.65 : 103,350.90 = 18,980.30 : x
  2. Step 2: Convert to fraction form
    68,904.65/103,350.90 = 18,980.30/x
  3. Step 3: Cross multiply
    68,904.65x = 103,350.90 × 18,980.30
  4. Step 4: Simplify right side
    68,904.65x = 1,961,631,087.27
  5. Step 5: Solve for x
    x = 1,961,631,087.27/68,904.65
  6. Step 6: Final answer
    x = 28,468.78

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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.