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Finding the Fourth Proportional to 205,816.60, 308,724.90 and 100,840.60

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Solution

The fourth proportional to 205,816.60, 308,724.90 and 100,840.60 is: 151,260.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,816.60 : 308,724.90 = 100,840.60 : x
  2. Step 2: Convert to fraction form
    205,816.60/308,724.90 = 100,840.60/x
  3. Step 3: Cross multiply
    205,816.60x = 308,724.90 × 100,840.60
  4. Step 4: Simplify right side
    205,816.60x = 31,132,004,150.94
  5. Step 5: Solve for x
    x = 31,132,004,150.94/205,816.60
  6. Step 6: Final answer
    x = 151,260.90

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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.