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Finding the Fourth Proportional to 209,172.88, 313,766.70 and 66,999.68

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Solution

The fourth proportional to 209,172.88, 313,766.70 and 66,999.68 is: 100,501.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,172.88 : 313,766.70 = 66,999.68 : x
  2. Step 2: Convert to fraction form
    209,172.88/313,766.70 = 66,999.68/x
  3. Step 3: Cross multiply
    209,172.88x = 313,766.70 × 66,999.68
  4. Step 4: Simplify right side
    209,172.88x = 21,022,268,494.66
  5. Step 5: Solve for x
    x = 21,022,268,494.66/209,172.88
  6. Step 6: Final answer
    x = 100,501.88

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1.5x scale

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.