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Finding the Fourth Proportional to 318.82, 440.20 and 245.02

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Solution

The fourth proportional to 318.82, 440.20 and 245.02 is: 338.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.82 : 440.20 = 245.02 : x
  2. Step 2: Convert to fraction form
    318.82/440.20 = 245.02/x
  3. Step 3: Cross multiply
    318.82x = 440.20 × 245.02
  4. Step 4: Simplify right side
    318.82x = 107,857.80
  5. Step 5: Solve for x
    x = 107,857.80/318.82
  6. Step 6: Final answer
    x = 338.30

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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.