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Finding the Fourth Proportional to 318.63, 478.17 and 113.21

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Solution

The fourth proportional to 318.63, 478.17 and 113.21 is: 169.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.63 : 478.17 = 113.21 : x
  2. Step 2: Convert to fraction form
    318.63/478.17 = 113.21/x
  3. Step 3: Cross multiply
    318.63x = 478.17 × 113.21
  4. Step 4: Simplify right side
    318.63x = 54,131.23
  5. Step 5: Solve for x
    x = 54,131.23/318.63
  6. Step 6: Final answer
    x = 169.89

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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.