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Finding the Fourth Proportional to 68,730.30, 103,091.64 and 18,806.81

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Solution

The fourth proportional to 68,730.30, 103,091.64 and 18,806.81 is: 28,209.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,730.30 : 103,091.64 = 18,806.81 : x
  2. Step 2: Convert to fraction form
    68,730.30/103,091.64 = 18,806.81/x
  3. Step 3: Cross multiply
    68,730.30x = 103,091.64 × 18,806.81
  4. Step 4: Simplify right side
    68,730.30x = 1,938,824,628.34
  5. Step 5: Solve for x
    x = 1,938,824,628.34/68,730.30
  6. Step 6: Final answer
    x = 28,209.17

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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.