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Finding the Fourth Proportional to 317.96, 438.79 and 178.09

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Solution

The fourth proportional to 317.96, 438.79 and 178.09 is: 245.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.96 : 438.79 = 178.09 : x
  2. Step 2: Convert to fraction form
    317.96/438.79 = 178.09/x
  3. Step 3: Cross multiply
    317.96x = 438.79 × 178.09
  4. Step 4: Simplify right side
    317.96x = 78,142.90
  5. Step 5: Solve for x
    x = 78,142.90/317.96
  6. Step 6: Final answer
    x = 245.76

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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.