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Finding the Fourth Proportional to 613.26, 918.66 and 381.60

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Solution

The fourth proportional to 613.26, 918.66 and 381.60 is: 571.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.26 : 918.66 = 381.60 : x
  2. Step 2: Convert to fraction form
    613.26/918.66 = 381.60/x
  3. Step 3: Cross multiply
    613.26x = 918.66 × 381.60
  4. Step 4: Simplify right side
    613.26x = 350,560.66
  5. Step 5: Solve for x
    x = 350,560.66/613.26
  6. Step 6: Final answer
    x = 571.63

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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.