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Finding the Fourth Proportional to 80,940.80, 121,216.80 and 77,441.60

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Solution

The fourth proportional to 80,940.80, 121,216.80 and 77,441.60 is: 115,976.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,940.80 : 121,216.80 = 77,441.60 : x
  2. Step 2: Convert to fraction form
    80,940.80/121,216.80 = 77,441.60/x
  3. Step 3: Cross multiply
    80,940.80x = 121,216.80 × 77,441.60
  4. Step 4: Simplify right side
    80,940.80x = 9,387,222,938.88
  5. Step 5: Solve for x
    x = 9,387,222,938.88/80,940.80
  6. Step 6: Final answer
    x = 115,976.40

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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.