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Finding the Fourth Proportional to 8,505.80, 12,759.90 and 2,661.80

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Solution

The fourth proportional to 8,505.80, 12,759.90 and 2,661.80 is: 3,993.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,505.80 : 12,759.90 = 2,661.80 : x
  2. Step 2: Convert to fraction form
    8,505.80/12,759.90 = 2,661.80/x
  3. Step 3: Cross multiply
    8,505.80x = 12,759.90 × 2,661.80
  4. Step 4: Simplify right side
    8,505.80x = 33,964,301.82
  5. Step 5: Solve for x
    x = 33,964,301.82/8,505.80
  6. Step 6: Final answer
    x = 3,993.08

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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.