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Finding the Fourth Proportional to 138,100.54, 190,550.16 and 80,728.78

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Solution

The fourth proportional to 138,100.54, 190,550.16 and 80,728.78 is: 111,389.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,100.54 : 190,550.16 = 80,728.78 : x
  2. Step 2: Convert to fraction form
    138,100.54/190,550.16 = 80,728.78/x
  3. Step 3: Cross multiply
    138,100.54x = 190,550.16 × 80,728.78
  4. Step 4: Simplify right side
    138,100.54x = 15,382,881,945.60
  5. Step 5: Solve for x
    x = 15,382,881,945.60/138,100.54
  6. Step 6: Final answer
    x = 111,389.01

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.