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Finding the Fourth Proportional to 318.79, 439.80 and 236.09

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Solution

The fourth proportional to 318.79, 439.80 and 236.09 is: 325.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.79 : 439.80 = 236.09 : x
  2. Step 2: Convert to fraction form
    318.79/439.80 = 236.09/x
  3. Step 3: Cross multiply
    318.79x = 439.80 × 236.09
  4. Step 4: Simplify right side
    318.79x = 103,832.38
  5. Step 5: Solve for x
    x = 103,832.38/318.79
  6. Step 6: Final answer
    x = 325.71

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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.