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Finding the Fourth Proportional to 318.69, 475.92 and 257.67

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Solution

The fourth proportional to 318.69, 475.92 and 257.67 is: 384.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.69 : 475.92 = 257.67 : x
  2. Step 2: Convert to fraction form
    318.69/475.92 = 257.67/x
  3. Step 3: Cross multiply
    318.69x = 475.92 × 257.67
  4. Step 4: Simplify right side
    318.69x = 122,630.31
  5. Step 5: Solve for x
    x = 122,630.31/318.69
  6. Step 6: Final answer
    x = 384.79

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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.