Home / 8,091.90-12,128.40-3,709.80

Finding the Fourth Proportional to 8,091.90, 12,128.40 and 3,709.80

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Solution

The fourth proportional to 8,091.90, 12,128.40 and 3,709.80 is: 5,560.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,091.90 : 12,128.40 = 3,709.80 : x
  2. Step 2: Convert to fraction form
    8,091.90/12,128.40 = 3,709.80/x
  3. Step 3: Cross multiply
    8,091.90x = 12,128.40 × 3,709.80
  4. Step 4: Simplify right side
    8,091.90x = 44,993,938.32
  5. Step 5: Solve for x
    x = 44,993,938.32/8,091.90
  6. Step 6: Final answer
    x = 5,560.37

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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.