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Finding the Fourth Proportional to 1,080.72, 1,620.73 and 387.20

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Solution

The fourth proportional to 1,080.72, 1,620.73 and 387.20 is: 580.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.72 : 1,620.73 = 387.20 : x
  2. Step 2: Convert to fraction form
    1,080.72/1,620.73 = 387.20/x
  3. Step 3: Cross multiply
    1,080.72x = 1,620.73 × 387.20
  4. Step 4: Simplify right side
    1,080.72x = 627,546.66
  5. Step 5: Solve for x
    x = 627,546.66/1,080.72
  6. Step 6: Final answer
    x = 580.67

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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.