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Finding the Fourth Proportional to 662.36, 913.74 and 455

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Solution

The fourth proportional to 662.36, 913.74 and 455 is: 627.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    662.36 : 913.74 = 455 : x
  2. Step 2: Convert to fraction form
    662.36/913.74 = 455/x
  3. Step 3: Cross multiply
    662.36x = 913.74 × 455
  4. Step 4: Simplify right side
    662.36x = 415,751.70
  5. Step 5: Solve for x
    x = 415,751.70/662.36
  6. Step 6: Final answer
    x = 627.68

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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.