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Finding the Fourth Proportional to 1,205.28, 1,805.44 and 627.20

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Solution

The fourth proportional to 1,205.28, 1,805.44 and 627.20 is: 939.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,205.28 : 1,805.44 = 627.20 : x
  2. Step 2: Convert to fraction form
    1,205.28/1,805.44 = 627.20/x
  3. Step 3: Cross multiply
    1,205.28x = 1,805.44 × 627.20
  4. Step 4: Simplify right side
    1,205.28x = 1,132,371.97
  5. Step 5: Solve for x
    x = 1,132,371.97/1,205.28
  6. Step 6: Final answer
    x = 939.51

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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.