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Finding the Fourth Proportional to 68,790.72, 103,186.22 and 18,871.50

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Solution

The fourth proportional to 68,790.72, 103,186.22 and 18,871.50 is: 28,307.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,790.72 : 103,186.22 = 18,871.50 : x
  2. Step 2: Convert to fraction form
    68,790.72/103,186.22 = 18,871.50/x
  3. Step 3: Cross multiply
    68,790.72x = 103,186.22 × 18,871.50
  4. Step 4: Simplify right side
    68,790.72x = 1,947,278,750.73
  5. Step 5: Solve for x
    x = 1,947,278,750.73/68,790.72
  6. Step 6: Final answer
    x = 28,307.29

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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.