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Finding the Fourth Proportional to 205,816.80, 308,725.20 and 171,991.20

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Solution

The fourth proportional to 205,816.80, 308,725.20 and 171,991.20 is: 257,986.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,816.80 : 308,725.20 = 171,991.20 : x
  2. Step 2: Convert to fraction form
    205,816.80/308,725.20 = 171,991.20/x
  3. Step 3: Cross multiply
    205,816.80x = 308,725.20 × 171,991.20
  4. Step 4: Simplify right side
    205,816.80x = 53,098,017,618.24
  5. Step 5: Solve for x
    x = 53,098,017,618.24/205,816.80
  6. Step 6: Final answer
    x = 257,986.80

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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.