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Finding the Fourth Proportional to 613.66, 918.99 and 396.58

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Solution

The fourth proportional to 613.66, 918.99 and 396.58 is: 593.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.66 : 918.99 = 396.58 : x
  2. Step 2: Convert to fraction form
    613.66/918.99 = 396.58/x
  3. Step 3: Cross multiply
    613.66x = 918.99 × 396.58
  4. Step 4: Simplify right side
    613.66x = 364,453.05
  5. Step 5: Solve for x
    x = 364,453.05/613.66
  6. Step 6: Final answer
    x = 593.90

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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.