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Finding the Fourth Proportional to 681.30, 1,021.61 and 450.05

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Solution

The fourth proportional to 681.30, 1,021.61 and 450.05 is: 674.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.30 : 1,021.61 = 450.05 : x
  2. Step 2: Convert to fraction form
    681.30/1,021.61 = 450.05/x
  3. Step 3: Cross multiply
    681.30x = 1,021.61 × 450.05
  4. Step 4: Simplify right side
    681.30x = 459,768.22
  5. Step 5: Solve for x
    x = 459,768.22/681.30
  6. Step 6: Final answer
    x = 674.84

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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.