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Finding the Fourth Proportional to 317.91, 438.68 and 185.09

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Solution

The fourth proportional to 317.91, 438.68 and 185.09 is: 255.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.91 : 438.68 = 185.09 : x
  2. Step 2: Convert to fraction form
    317.91/438.68 = 185.09/x
  3. Step 3: Cross multiply
    317.91x = 438.68 × 185.09
  4. Step 4: Simplify right side
    317.91x = 81,195.28
  5. Step 5: Solve for x
    x = 81,195.28/317.91
  6. Step 6: Final answer
    x = 255.40

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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.