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Finding the Fourth Proportional to 85,907.80, 128,707.26 and 80,843.44

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Solution

The fourth proportional to 85,907.80, 128,707.26 and 80,843.44 is: 121,119.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,907.80 : 128,707.26 = 80,843.44 : x
  2. Step 2: Convert to fraction form
    85,907.80/128,707.26 = 80,843.44/x
  3. Step 3: Cross multiply
    85,907.80x = 128,707.26 × 80,843.44
  4. Step 4: Simplify right side
    85,907.80x = 10,405,137,651.37
  5. Step 5: Solve for x
    x = 10,405,137,651.37/85,907.80
  6. Step 6: Final answer
    x = 121,119.82

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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.