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Finding the Fourth Proportional to 361.77, 499.40 and 299.80

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Solution

The fourth proportional to 361.77, 499.40 and 299.80 is: 413.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    361.77 : 499.40 = 299.80 : x
  2. Step 2: Convert to fraction form
    361.77/499.40 = 299.80/x
  3. Step 3: Cross multiply
    361.77x = 499.40 × 299.80
  4. Step 4: Simplify right side
    361.77x = 149,720.12
  5. Step 5: Solve for x
    x = 149,720.12/361.77
  6. Step 6: Final answer
    x = 413.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.