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Finding the Fourth Proportional to 613.66, 920.94 and 408.16

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Solution

The fourth proportional to 613.66, 920.94 and 408.16 is: 612.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.66 : 920.94 = 408.16 : x
  2. Step 2: Convert to fraction form
    613.66/920.94 = 408.16/x
  3. Step 3: Cross multiply
    613.66x = 920.94 × 408.16
  4. Step 4: Simplify right side
    613.66x = 375,890.87
  5. Step 5: Solve for x
    x = 375,890.87/613.66
  6. Step 6: Final answer
    x = 612.54

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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.