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Finding the Fourth Proportional to 685,816.80, 1,028,728.80 and 187,180.80

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Solution

The fourth proportional to 685,816.80, 1,028,728.80 and 187,180.80 is: 280,772.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,816.80 : 1,028,728.80 = 187,180.80 : x
  2. Step 2: Convert to fraction form
    685,816.80/1,028,728.80 = 187,180.80/x
  3. Step 3: Cross multiply
    685,816.80x = 1,028,728.80 × 187,180.80
  4. Step 4: Simplify right side
    685,816.80x = 192,558,279,767.04
  5. Step 5: Solve for x
    x = 192,558,279,767.04/685,816.80
  6. Step 6: Final answer
    x = 280,772.18

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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.