Home / 1,441.21-1,988.94-811.75

Finding the Fourth Proportional to 1,441.21, 1,988.94 and 811.75

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Solution

The fourth proportional to 1,441.21, 1,988.94 and 811.75 is: 1,120.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,441.21 : 1,988.94 = 811.75 : x
  2. Step 2: Convert to fraction form
    1,441.21/1,988.94 = 811.75/x
  3. Step 3: Cross multiply
    1,441.21x = 1,988.94 × 811.75
  4. Step 4: Simplify right side
    1,441.21x = 1,614,522.05
  5. Step 5: Solve for x
    x = 1,614,522.05/1,441.21
  6. Step 6: Final answer
    x = 1,120.25

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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.