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Finding the Fourth Proportional to 318.72, 478.07 and 102.30

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Solution

The fourth proportional to 318.72, 478.07 and 102.30 is: 153.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.72 : 478.07 = 102.30 : x
  2. Step 2: Convert to fraction form
    318.72/478.07 = 102.30/x
  3. Step 3: Cross multiply
    318.72x = 478.07 × 102.30
  4. Step 4: Simplify right side
    318.72x = 48,906.56
  5. Step 5: Solve for x
    x = 48,906.56/318.72
  6. Step 6: Final answer
    x = 153.45

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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.