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Finding the Fourth Proportional to 1,993.72, 2,987.85 and 1,261.99

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Solution

The fourth proportional to 1,993.72, 2,987.85 and 1,261.99 is: 1,891.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,993.72 : 2,987.85 = 1,261.99 : x
  2. Step 2: Convert to fraction form
    1,993.72/2,987.85 = 1,261.99/x
  3. Step 3: Cross multiply
    1,993.72x = 2,987.85 × 1,261.99
  4. Step 4: Simplify right side
    1,993.72x = 3,770,636.82
  5. Step 5: Solve for x
    x = 3,770,636.82/1,993.72
  6. Step 6: Final answer
    x = 1,891.26

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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.