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Finding the Fourth Proportional to 2,115.75, 2,919.75 and 1,184.25

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Solution

The fourth proportional to 2,115.75, 2,919.75 and 1,184.25 is: 1,634.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115.75 : 2,919.75 = 1,184.25 : x
  2. Step 2: Convert to fraction form
    2,115.75/2,919.75 = 1,184.25/x
  3. Step 3: Cross multiply
    2,115.75x = 2,919.75 × 1,184.25
  4. Step 4: Simplify right side
    2,115.75x = 3,457,713.94
  5. Step 5: Solve for x
    x = 3,457,713.94/2,115.75
  6. Step 6: Final answer
    x = 1,634.27

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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.