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Finding the Fourth Proportional to 208,991.60, 313,487.40 and 68,716.40

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Solution

The fourth proportional to 208,991.60, 313,487.40 and 68,716.40 is: 103,074.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,991.60 : 313,487.40 = 68,716.40 : x
  2. Step 2: Convert to fraction form
    208,991.60/313,487.40 = 68,716.40/x
  3. Step 3: Cross multiply
    208,991.60x = 313,487.40 × 68,716.40
  4. Step 4: Simplify right side
    208,991.60x = 21,541,725,573.36
  5. Step 5: Solve for x
    x = 21,541,725,573.36/208,991.60
  6. Step 6: Final answer
    x = 103,074.60

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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.