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Finding the Fourth Proportional to 1,080.55, 1,620.81 and 387.03

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Solution

The fourth proportional to 1,080.55, 1,620.81 and 387.03 is: 580.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.55 : 1,620.81 = 387.03 : x
  2. Step 2: Convert to fraction form
    1,080.55/1,620.81 = 387.03/x
  3. Step 3: Cross multiply
    1,080.55x = 1,620.81 × 387.03
  4. Step 4: Simplify right side
    1,080.55x = 627,302.09
  5. Step 5: Solve for x
    x = 627,302.09/1,080.55
  6. Step 6: Final answer
    x = 580.54

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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.