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Finding the Fourth Proportional to 311.91, 465.44 and 279.06

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Solution

The fourth proportional to 311.91, 465.44 and 279.06 is: 416.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.91 : 465.44 = 279.06 : x
  2. Step 2: Convert to fraction form
    311.91/465.44 = 279.06/x
  3. Step 3: Cross multiply
    311.91x = 465.44 × 279.06
  4. Step 4: Simplify right side
    311.91x = 129,885.69
  5. Step 5: Solve for x
    x = 129,885.69/311.91
  6. Step 6: Final answer
    x = 416.42

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.