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Finding the Fourth Proportional to 69,780.30, 104,671.65 and 19,861.68

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Solution

The fourth proportional to 69,780.30, 104,671.65 and 19,861.68 is: 29,792.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,780.30 : 104,671.65 = 19,861.68 : x
  2. Step 2: Convert to fraction form
    69,780.30/104,671.65 = 19,861.68/x
  3. Step 3: Cross multiply
    69,780.30x = 104,671.65 × 19,861.68
  4. Step 4: Simplify right side
    69,780.30x = 2,078,954,817.37
  5. Step 5: Solve for x
    x = 2,078,954,817.37/69,780.30
  6. Step 6: Final answer
    x = 29,792.86

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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.