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Finding the Fourth Proportional to 81,340.80, 121,816.80 and 65,788.80

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Solution

The fourth proportional to 81,340.80, 121,816.80 and 65,788.80 is: 98,525.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,340.80 : 121,816.80 = 65,788.80 : x
  2. Step 2: Convert to fraction form
    81,340.80/121,816.80 = 65,788.80/x
  3. Step 3: Cross multiply
    81,340.80x = 121,816.80 × 65,788.80
  4. Step 4: Simplify right side
    81,340.80x = 8,014,181,091.84
  5. Step 5: Solve for x
    x = 8,014,181,091.84/81,340.80
  6. Step 6: Final answer
    x = 98,525.97

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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.