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Finding the Fourth Proportional to 668.66, 1,002.23 and 418.61

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Solution

The fourth proportional to 668.66, 1,002.23 and 418.61 is: 627.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.66 : 1,002.23 = 418.61 : x
  2. Step 2: Convert to fraction form
    668.66/1,002.23 = 418.61/x
  3. Step 3: Cross multiply
    668.66x = 1,002.23 × 418.61
  4. Step 4: Simplify right side
    668.66x = 419,543.50
  5. Step 5: Solve for x
    x = 419,543.50/668.66
  6. Step 6: Final answer
    x = 627.44

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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.