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Finding the Fourth Proportional to 317.21, 437.62 and 255.72

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Solution

The fourth proportional to 317.21, 437.62 and 255.72 is: 352.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.21 : 437.62 = 255.72 : x
  2. Step 2: Convert to fraction form
    317.21/437.62 = 255.72/x
  3. Step 3: Cross multiply
    317.21x = 437.62 × 255.72
  4. Step 4: Simplify right side
    317.21x = 111,908.19
  5. Step 5: Solve for x
    x = 111,908.19/317.21
  6. Step 6: Final answer
    x = 352.79

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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.