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Finding the Fourth Proportional to 318, 439 and 298.80

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Solution

The fourth proportional to 318, 439 and 298.80 is: 412.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    318 : 439 = 298.80 : x
  2. Step 2: Convert to fraction form
    318/439 = 298.80/x
  3. Step 3: Cross multiply
    318x = 439 × 298.80
  4. Step 4: Simplify right side
    318x = 131,173.20
  5. Step 5: Solve for x
    x = 131,173.20/318
  6. Step 6: Final answer
    x = 412.49

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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.