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Finding the Fourth Proportional to 361.61, 499.40 and 305.72

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Solution

The fourth proportional to 361.61, 499.40 and 305.72 is: 422.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    361.61 : 499.40 = 305.72 : x
  2. Step 2: Convert to fraction form
    361.61/499.40 = 305.72/x
  3. Step 3: Cross multiply
    361.61x = 499.40 × 305.72
  4. Step 4: Simplify right side
    361.61x = 152,676.57
  5. Step 5: Solve for x
    x = 152,676.57/361.61
  6. Step 6: Final answer
    x = 422.21

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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.