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Finding the Fourth Proportional to 81,190.80, 121,786.20 and 51,739.20

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Solution

The fourth proportional to 81,190.80, 121,786.20 and 51,739.20 is: 77,608.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,190.80 : 121,786.20 = 51,739.20 : x
  2. Step 2: Convert to fraction form
    81,190.80/121,786.20 = 51,739.20/x
  3. Step 3: Cross multiply
    81,190.80x = 121,786.20 × 51,739.20
  4. Step 4: Simplify right side
    81,190.80x = 6,301,120,559.04
  5. Step 5: Solve for x
    x = 6,301,120,559.04/81,190.80
  6. Step 6: Final answer
    x = 77,608.80

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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.