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Finding the Fourth Proportional to 668.11, 1,001.50 and 321.35

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Solution

The fourth proportional to 668.11, 1,001.50 and 321.35 is: 481.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.11 : 1,001.50 = 321.35 : x
  2. Step 2: Convert to fraction form
    668.11/1,001.50 = 321.35/x
  3. Step 3: Cross multiply
    668.11x = 1,001.50 × 321.35
  4. Step 4: Simplify right side
    668.11x = 321,826.21
  5. Step 5: Solve for x
    x = 321,826.21/668.11
  6. Step 6: Final answer
    x = 481.70

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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.