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Finding the Fourth Proportional to 668.46, 1,003.77 and 413.58

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Solution

The fourth proportional to 668.46, 1,003.77 and 413.58 is: 621.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.46 : 1,003.77 = 413.58 : x
  2. Step 2: Convert to fraction form
    668.46/1,003.77 = 413.58/x
  3. Step 3: Cross multiply
    668.46x = 1,003.77 × 413.58
  4. Step 4: Simplify right side
    668.46x = 415,139.20
  5. Step 5: Solve for x
    x = 415,139.20/668.46
  6. Step 6: Final answer
    x = 621.04

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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.