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Finding the Fourth Proportional to 255.70, 352.89 and 145.20

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Solution

The fourth proportional to 255.70, 352.89 and 145.20 is: 200.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.70 : 352.89 = 145.20 : x
  2. Step 2: Convert to fraction form
    255.70/352.89 = 145.20/x
  3. Step 3: Cross multiply
    255.70x = 352.89 × 145.20
  4. Step 4: Simplify right side
    255.70x = 51,239.63
  5. Step 5: Solve for x
    x = 51,239.63/255.70
  6. Step 6: Final answer
    x = 200.39

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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.