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Finding the Fourth Proportional to 318.20, 439.11 and 187.17

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Solution

The fourth proportional to 318.20, 439.11 and 187.17 is: 258.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.20 : 439.11 = 187.17 : x
  2. Step 2: Convert to fraction form
    318.20/439.11 = 187.17/x
  3. Step 3: Cross multiply
    318.20x = 439.11 × 187.17
  4. Step 4: Simplify right side
    318.20x = 82,188.22
  5. Step 5: Solve for x
    x = 82,188.22/318.20
  6. Step 6: Final answer
    x = 258.30

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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.