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Finding the Fourth Proportional to 361.94, 499.92 and 312.80

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Solution

The fourth proportional to 361.94, 499.92 and 312.80 is: 432.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    361.94 : 499.92 = 312.80 : x
  2. Step 2: Convert to fraction form
    361.94/499.92 = 312.80/x
  3. Step 3: Cross multiply
    361.94x = 499.92 × 312.80
  4. Step 4: Simplify right side
    361.94x = 156,374.98
  5. Step 5: Solve for x
    x = 156,374.98/361.94
  6. Step 6: Final answer
    x = 432.05

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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.