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Finding the Fourth Proportional to 255.75, 352.87 and 145.21

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Solution

The fourth proportional to 255.75, 352.87 and 145.21 is: 200.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.75 : 352.87 = 145.21 : x
  2. Step 2: Convert to fraction form
    255.75/352.87 = 145.21/x
  3. Step 3: Cross multiply
    255.75x = 352.87 × 145.21
  4. Step 4: Simplify right side
    255.75x = 51,240.25
  5. Step 5: Solve for x
    x = 51,240.25/255.75
  6. Step 6: Final answer
    x = 200.35

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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.