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Finding the Fourth Proportional to 137,910.70, 206,866.05 and 102,918.70

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Solution

The fourth proportional to 137,910.70, 206,866.05 and 102,918.70 is: 154,378.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,910.70 : 206,866.05 = 102,918.70 : x
  2. Step 2: Convert to fraction form
    137,910.70/206,866.05 = 102,918.70/x
  3. Step 3: Cross multiply
    137,910.70x = 206,866.05 × 102,918.70
  4. Step 4: Simplify right side
    137,910.70x = 21,290,384,940.14
  5. Step 5: Solve for x
    x = 21,290,384,940.14/137,910.70
  6. Step 6: Final answer
    x = 154,378.05

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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.