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Finding the Fourth Proportional to 186,640.20, 279,960.30 and 111,990.60

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Solution

The fourth proportional to 186,640.20, 279,960.30 and 111,990.60 is: 167,985.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    186,640.20 : 279,960.30 = 111,990.60 : x
  2. Step 2: Convert to fraction form
    186,640.20/279,960.30 = 111,990.60/x
  3. Step 3: Cross multiply
    186,640.20x = 279,960.30 × 111,990.60
  4. Step 4: Simplify right side
    186,640.20x = 31,352,921,973.18
  5. Step 5: Solve for x
    x = 31,352,921,973.18/186,640.20
  6. Step 6: Final answer
    x = 167,985.90

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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.