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Finding the Fourth Proportional to 68,890.56, 103,335.72 and 18,970.96

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Solution

The fourth proportional to 68,890.56, 103,335.72 and 18,970.96 is: 28,456.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,890.56 : 103,335.72 = 18,970.96 : x
  2. Step 2: Convert to fraction form
    68,890.56/103,335.72 = 18,970.96/x
  3. Step 3: Cross multiply
    68,890.56x = 103,335.72 × 18,970.96
  4. Step 4: Simplify right side
    68,890.56x = 1,960,377,810.69
  5. Step 5: Solve for x
    x = 1,960,377,810.69/68,890.56
  6. Step 6: Final answer
    x = 28,456.41

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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.