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Finding the Fourth Proportional to 81,321.54, 121,975.11 and 28,728.42

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Solution

The fourth proportional to 81,321.54, 121,975.11 and 28,728.42 is: 43,090.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,321.54 : 121,975.11 = 28,728.42 : x
  2. Step 2: Convert to fraction form
    81,321.54/121,975.11 = 28,728.42/x
  3. Step 3: Cross multiply
    81,321.54x = 121,975.11 × 28,728.42
  4. Step 4: Simplify right side
    81,321.54x = 3,504,152,189.63
  5. Step 5: Solve for x
    x = 3,504,152,189.63/81,321.54
  6. Step 6: Final answer
    x = 43,090.09

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1.5x scale

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.