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Finding the Fourth Proportional to 68,808.36, 103,389.66 and 66,881.64

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Solution

The fourth proportional to 68,808.36, 103,389.66 and 66,881.64 is: 100,494.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,808.36 : 103,389.66 = 66,881.64 : x
  2. Step 2: Convert to fraction form
    68,808.36/103,389.66 = 66,881.64/x
  3. Step 3: Cross multiply
    68,808.36x = 103,389.66 × 66,881.64
  4. Step 4: Simplify right side
    68,808.36x = 6,914,870,019.84
  5. Step 5: Solve for x
    x = 6,914,870,019.84/68,808.36
  6. Step 6: Final answer
    x = 100,494.62

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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.