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Finding the Fourth Proportional to 668.95, 1,002.23 and 412.15

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Solution

The fourth proportional to 668.95, 1,002.23 and 412.15 is: 617.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.95 : 1,002.23 = 412.15 : x
  2. Step 2: Convert to fraction form
    668.95/1,002.23 = 412.15/x
  3. Step 3: Cross multiply
    668.95x = 1,002.23 × 412.15
  4. Step 4: Simplify right side
    668.95x = 413,067.03
  5. Step 5: Solve for x
    x = 413,067.03/668.95
  6. Step 6: Final answer
    x = 617.49

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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.