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Finding the Fourth Proportional to 318.78, 439.95 and 194.45

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Solution

The fourth proportional to 318.78, 439.95 and 194.45 is: 268.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.78 : 439.95 = 194.45 : x
  2. Step 2: Convert to fraction form
    318.78/439.95 = 194.45/x
  3. Step 3: Cross multiply
    318.78x = 439.95 × 194.45
  4. Step 4: Simplify right side
    318.78x = 85,546.08
  5. Step 5: Solve for x
    x = 85,546.08/318.78
  6. Step 6: Final answer
    x = 268.35

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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.