Home / 3,131.60-4,321.50-1,805.08

Finding the Fourth Proportional to 3,131.60, 4,321.50 and 1,805.08

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Solution

The fourth proportional to 3,131.60, 4,321.50 and 1,805.08 is: 2,490.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,131.60 : 4,321.50 = 1,805.08 : x
  2. Step 2: Convert to fraction form
    3,131.60/4,321.50 = 1,805.08/x
  3. Step 3: Cross multiply
    3,131.60x = 4,321.50 × 1,805.08
  4. Step 4: Simplify right side
    3,131.60x = 7,800,653.22
  5. Step 5: Solve for x
    x = 7,800,653.22/3,131.60
  6. Step 6: Final answer
    x = 2,490.95

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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.