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Finding the Fourth Proportional to 367.98, 506.55 and 311.68

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Solution

The fourth proportional to 367.98, 506.55 and 311.68 is: 429.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    367.98 : 506.55 = 311.68 : x
  2. Step 2: Convert to fraction form
    367.98/506.55 = 311.68/x
  3. Step 3: Cross multiply
    367.98x = 506.55 × 311.68
  4. Step 4: Simplify right side
    367.98x = 157,881.50
  5. Step 5: Solve for x
    x = 157,881.50/367.98
  6. Step 6: Final answer
    x = 429.05

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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.