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Finding the Fourth Proportional to 318.25, 439.16 and 185.45

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Solution

The fourth proportional to 318.25, 439.16 and 185.45 is: 255.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.25 : 439.16 = 185.45 : x
  2. Step 2: Convert to fraction form
    318.25/439.16 = 185.45/x
  3. Step 3: Cross multiply
    318.25x = 439.16 × 185.45
  4. Step 4: Simplify right side
    318.25x = 81,442.22
  5. Step 5: Solve for x
    x = 81,442.22/318.25
  6. Step 6: Final answer
    x = 255.91

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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.