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Finding the Fourth Proportional to 318.31, 439.31 and 220.03

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Solution

The fourth proportional to 318.31, 439.31 and 220.03 is: 303.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.31 : 439.31 = 220.03 : x
  2. Step 2: Convert to fraction form
    318.31/439.31 = 220.03/x
  3. Step 3: Cross multiply
    318.31x = 439.31 × 220.03
  4. Step 4: Simplify right side
    318.31x = 96,661.38
  5. Step 5: Solve for x
    x = 96,661.38/318.31
  6. Step 6: Final answer
    x = 303.67

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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.