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Finding the Fourth Proportional to 668.03, 1,001.21 and 321.08

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Solution

The fourth proportional to 668.03, 1,001.21 and 321.08 is: 481.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.03 : 1,001.21 = 321.08 : x
  2. Step 2: Convert to fraction form
    668.03/1,001.21 = 321.08/x
  3. Step 3: Cross multiply
    668.03x = 1,001.21 × 321.08
  4. Step 4: Simplify right side
    668.03x = 321,461.90
  5. Step 5: Solve for x
    x = 321,461.90/668.03
  6. Step 6: Final answer
    x = 481.21

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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.