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Finding the Fourth Proportional to 668.06, 999.70 and 408.13

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Solution

The fourth proportional to 668.06, 999.70 and 408.13 is: 610.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.06 : 999.70 = 408.13 : x
  2. Step 2: Convert to fraction form
    668.06/999.70 = 408.13/x
  3. Step 3: Cross multiply
    668.06x = 999.70 × 408.13
  4. Step 4: Simplify right side
    668.06x = 408,000.52
  5. Step 5: Solve for x
    x = 408,000.52/668.06
  6. Step 6: Final answer
    x = 610.72

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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.