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Finding the Fourth Proportional to 318.31, 439.31 and 187.36

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Solution

The fourth proportional to 318.31, 439.31 and 187.36 is: 258.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.31 : 439.31 = 187.36 : x
  2. Step 2: Convert to fraction form
    318.31/439.31 = 187.36/x
  3. Step 3: Cross multiply
    318.31x = 439.31 × 187.36
  4. Step 4: Simplify right side
    318.31x = 82,309.12
  5. Step 5: Solve for x
    x = 82,309.12/318.31
  6. Step 6: Final answer
    x = 258.58

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.