Home / 2,120.85-2,926.77-1,189.35

Finding the Fourth Proportional to 2,120.85, 2,926.77 and 1,189.35

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Solution

The fourth proportional to 2,120.85, 2,926.77 and 1,189.35 is: 1,641.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,120.85 : 2,926.77 = 1,189.35 : x
  2. Step 2: Convert to fraction form
    2,120.85/2,926.77 = 1,189.35/x
  3. Step 3: Cross multiply
    2,120.85x = 2,926.77 × 1,189.35
  4. Step 4: Simplify right side
    2,120.85x = 3,480,939.27
  5. Step 5: Solve for x
    x = 3,480,939.27/2,120.85
  6. Step 6: Final answer
    x = 1,641.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.