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Finding the Fourth Proportional to 257.62, 386.62 and 134.21

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Solution

The fourth proportional to 257.62, 386.62 and 134.21 is: 201.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.62 : 386.62 = 134.21 : x
  2. Step 2: Convert to fraction form
    257.62/386.62 = 134.21/x
  3. Step 3: Cross multiply
    257.62x = 386.62 × 134.21
  4. Step 4: Simplify right side
    257.62x = 51,887.60
  5. Step 5: Solve for x
    x = 51,887.60/257.62
  6. Step 6: Final answer
    x = 201.41

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.