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Finding the Fourth Proportional to 2,081.77, 3,121.72 and 782.32

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Solution

The fourth proportional to 2,081.77, 3,121.72 and 782.32 is: 1,173.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,081.77 : 3,121.72 = 782.32 : x
  2. Step 2: Convert to fraction form
    2,081.77/3,121.72 = 782.32/x
  3. Step 3: Cross multiply
    2,081.77x = 3,121.72 × 782.32
  4. Step 4: Simplify right side
    2,081.77x = 2,442,183.99
  5. Step 5: Solve for x
    x = 2,442,183.99/2,081.77
  6. Step 6: Final answer
    x = 1,173.13

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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.