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Finding the Fourth Proportional to 316.90, 437.57 and 255.21

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Solution

The fourth proportional to 316.90, 437.57 and 255.21 is: 352.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.90 : 437.57 = 255.21 : x
  2. Step 2: Convert to fraction form
    316.90/437.57 = 255.21/x
  3. Step 3: Cross multiply
    316.90x = 437.57 × 255.21
  4. Step 4: Simplify right side
    316.90x = 111,672.24
  5. Step 5: Solve for x
    x = 111,672.24/316.90
  6. Step 6: Final answer
    x = 352.39

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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.