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Finding the Fourth Proportional to 318.89, 478.31 and 102.48

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Solution

The fourth proportional to 318.89, 478.31 and 102.48 is: 153.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.89 : 478.31 = 102.48 : x
  2. Step 2: Convert to fraction form
    318.89/478.31 = 102.48/x
  3. Step 3: Cross multiply
    318.89x = 478.31 × 102.48
  4. Step 4: Simplify right side
    318.89x = 49,016.70
  5. Step 5: Solve for x
    x = 49,016.70/318.89
  6. Step 6: Final answer
    x = 153.71

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.