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Finding the Fourth Proportional to 100,571.25, 138,811.20 and 66,581.02

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Solution

The fourth proportional to 100,571.25, 138,811.20 and 66,581.02 is: 91,896.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,571.25 : 138,811.20 = 66,581.02 : x
  2. Step 2: Convert to fraction form
    100,571.25/138,811.20 = 66,581.02/x
  3. Step 3: Cross multiply
    100,571.25x = 138,811.20 × 66,581.02
  4. Step 4: Simplify right side
    100,571.25x = 9,242,190,589.37
  5. Step 5: Solve for x
    x = 9,242,190,589.37/100,571.25
  6. Step 6: Final answer
    x = 91,896.94

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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.