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Finding the Fourth Proportional to 376.11, 518.54 and 305.91

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Solution

The fourth proportional to 376.11, 518.54 and 305.91 is: 421.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    376.11 : 518.54 = 305.91 : x
  2. Step 2: Convert to fraction form
    376.11/518.54 = 305.91/x
  3. Step 3: Cross multiply
    376.11x = 518.54 × 305.91
  4. Step 4: Simplify right side
    376.11x = 158,625.04
  5. Step 5: Solve for x
    x = 158,625.04/376.11
  6. Step 6: Final answer
    x = 421.75

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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.