Home / 3,855.15-5,780.70-1,389.60

Finding the Fourth Proportional to 3,855.15, 5,780.70 and 1,389.60

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Solution

The fourth proportional to 3,855.15, 5,780.70 and 1,389.60 is: 2,083.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,855.15 : 5,780.70 = 1,389.60 : x
  2. Step 2: Convert to fraction form
    3,855.15/5,780.70 = 1,389.60/x
  3. Step 3: Cross multiply
    3,855.15x = 5,780.70 × 1,389.60
  4. Step 4: Simplify right side
    3,855.15x = 8,032,860.72
  5. Step 5: Solve for x
    x = 8,032,860.72/3,855.15
  6. Step 6: Final answer
    x = 2,083.67

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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.