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Finding the Fourth Proportional to 255.72, 352.87 and 145.20

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Solution

The fourth proportional to 255.72, 352.87 and 145.20 is: 200.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.72 : 352.87 = 145.20 : x
  2. Step 2: Convert to fraction form
    255.72/352.87 = 145.20/x
  3. Step 3: Cross multiply
    255.72x = 352.87 × 145.20
  4. Step 4: Simplify right side
    255.72x = 51,236.72
  5. Step 5: Solve for x
    x = 51,236.72/255.72
  6. Step 6: Final answer
    x = 200.36

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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.