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Finding the Fourth Proportional to 318.11, 438.93 and 185.36

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Solution

The fourth proportional to 318.11, 438.93 and 185.36 is: 255.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.11 : 438.93 = 185.36 : x
  2. Step 2: Convert to fraction form
    318.11/438.93 = 185.36/x
  3. Step 3: Cross multiply
    318.11x = 438.93 × 185.36
  4. Step 4: Simplify right side
    318.11x = 81,357.87
  5. Step 5: Solve for x
    x = 81,357.87/318.11
  6. Step 6: Final answer
    x = 255.76

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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.