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Finding the Fourth Proportional to 318.44, 439.35 and 187.49

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Solution

The fourth proportional to 318.44, 439.35 and 187.49 is: 258.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.44 : 439.35 = 187.49 : x
  2. Step 2: Convert to fraction form
    318.44/439.35 = 187.49/x
  3. Step 3: Cross multiply
    318.44x = 439.35 × 187.49
  4. Step 4: Simplify right side
    318.44x = 82,373.73
  5. Step 5: Solve for x
    x = 82,373.73/318.44
  6. Step 6: Final answer
    x = 258.68

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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.