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Finding the Fourth Proportional to 1,080.21, 1,621.80 and 860.97

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Solution

The fourth proportional to 1,080.21, 1,621.80 and 860.97 is: 1,292.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.21 : 1,621.80 = 860.97 : x
  2. Step 2: Convert to fraction form
    1,080.21/1,621.80 = 860.97/x
  3. Step 3: Cross multiply
    1,080.21x = 1,621.80 × 860.97
  4. Step 4: Simplify right side
    1,080.21x = 1,396,321.15
  5. Step 5: Solve for x
    x = 1,396,321.15/1,080.21
  6. Step 6: Final answer
    x = 1,292.64

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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.