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Finding the Fourth Proportional to 318.33, 438.75 and 239.63

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Solution

The fourth proportional to 318.33, 438.75 and 239.63 is: 330.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.33 : 438.75 = 239.63 : x
  2. Step 2: Convert to fraction form
    318.33/438.75 = 239.63/x
  3. Step 3: Cross multiply
    318.33x = 438.75 × 239.63
  4. Step 4: Simplify right side
    318.33x = 105,135.47
  5. Step 5: Solve for x
    x = 105,135.47/318.33
  6. Step 6: Final answer
    x = 330.27

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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.