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Finding the Fourth Proportional to 662.05, 990.78 and 455.23

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Solution

The fourth proportional to 662.05, 990.78 and 455.23 is: 681.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    662.05 : 990.78 = 455.23 : x
  2. Step 2: Convert to fraction form
    662.05/990.78 = 455.23/x
  3. Step 3: Cross multiply
    662.05x = 990.78 × 455.23
  4. Step 4: Simplify right side
    662.05x = 451,032.78
  5. Step 5: Solve for x
    x = 451,032.78/662.05
  6. Step 6: Final answer
    x = 681.27

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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.