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Finding the Fourth Proportional to 668.99, 1,005.38 and 395.21

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Solution

The fourth proportional to 668.99, 1,005.38 and 395.21 is: 593.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.99 : 1,005.38 = 395.21 : x
  2. Step 2: Convert to fraction form
    668.99/1,005.38 = 395.21/x
  3. Step 3: Cross multiply
    668.99x = 1,005.38 × 395.21
  4. Step 4: Simplify right side
    668.99x = 397,336.23
  5. Step 5: Solve for x
    x = 397,336.23/668.99
  6. Step 6: Final answer
    x = 593.93

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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.