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Finding the Fourth Proportional to 68,881.81, 103,309.02 and 18,949

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Solution

The fourth proportional to 68,881.81, 103,309.02 and 18,949 is: 28,419.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,881.81 : 103,309.02 = 18,949 : x
  2. Step 2: Convert to fraction form
    68,881.81/103,309.02 = 18,949/x
  3. Step 3: Cross multiply
    68,881.81x = 103,309.02 × 18,949
  4. Step 4: Simplify right side
    68,881.81x = 1,957,602,619.98
  5. Step 5: Solve for x
    x = 1,957,602,619.98/68,881.81
  6. Step 6: Final answer
    x = 28,419.73

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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.