Home / 2,081.90-3,118.80-1,155.80

Finding the Fourth Proportional to 2,081.90, 3,118.80 and 1,155.80

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Solution

The fourth proportional to 2,081.90, 3,118.80 and 1,155.80 is: 1,731.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,081.90 : 3,118.80 = 1,155.80 : x
  2. Step 2: Convert to fraction form
    2,081.90/3,118.80 = 1,155.80/x
  3. Step 3: Cross multiply
    2,081.90x = 3,118.80 × 1,155.80
  4. Step 4: Simplify right side
    2,081.90x = 3,604,709.04
  5. Step 5: Solve for x
    x = 3,604,709.04/2,081.90
  6. Step 6: Final answer
    x = 1,731.45

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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.