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Finding the Fourth Proportional to 148,998.50, 205,617.93 and 81,930.50

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Solution

The fourth proportional to 148,998.50, 205,617.93 and 81,930.50 is: 113,064.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    148,998.50 : 205,617.93 = 81,930.50 : x
  2. Step 2: Convert to fraction form
    148,998.50/205,617.93 = 81,930.50/x
  3. Step 3: Cross multiply
    148,998.50x = 205,617.93 × 81,930.50
  4. Step 4: Simplify right side
    148,998.50x = 16,846,379,813.87
  5. Step 5: Solve for x
    x = 16,846,379,813.87/148,998.50
  6. Step 6: Final answer
    x = 113,064.09

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.