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Finding the Fourth Proportional to 613.38, 919.61 and 369.85

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Solution

The fourth proportional to 613.38, 919.61 and 369.85 is: 554.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.38 : 919.61 = 369.85 : x
  2. Step 2: Convert to fraction form
    613.38/919.61 = 369.85/x
  3. Step 3: Cross multiply
    613.38x = 919.61 × 369.85
  4. Step 4: Simplify right side
    613.38x = 340,111.31
  5. Step 5: Solve for x
    x = 340,111.31/613.38
  6. Step 6: Final answer
    x = 554.49

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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.