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Finding the Fourth Proportional to 255.21, 352.14 and 155.60

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Solution

The fourth proportional to 255.21, 352.14 and 155.60 is: 214.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.21 : 352.14 = 155.60 : x
  2. Step 2: Convert to fraction form
    255.21/352.14 = 155.60/x
  3. Step 3: Cross multiply
    255.21x = 352.14 × 155.60
  4. Step 4: Simplify right side
    255.21x = 54,791.96
  5. Step 5: Solve for x
    x = 54,791.96/255.21
  6. Step 6: Final answer
    x = 214.70

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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.