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Finding the Fourth Proportional to 661.16, 990.60 and 455.48

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Solution

The fourth proportional to 661.16, 990.60 and 455.48 is: 682.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.16 : 990.60 = 455.48 : x
  2. Step 2: Convert to fraction form
    661.16/990.60 = 455.48/x
  3. Step 3: Cross multiply
    661.16x = 990.60 × 455.48
  4. Step 4: Simplify right side
    661.16x = 451,198.49
  5. Step 5: Solve for x
    x = 451,198.49/661.16
  6. Step 6: Final answer
    x = 682.43

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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.