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Finding the Fourth Proportional to 255.42, 352.64 and 172.71

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Solution

The fourth proportional to 255.42, 352.64 and 172.71 is: 238.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.42 : 352.64 = 172.71 : x
  2. Step 2: Convert to fraction form
    255.42/352.64 = 172.71/x
  3. Step 3: Cross multiply
    255.42x = 352.64 × 172.71
  4. Step 4: Simplify right side
    255.42x = 60,906.21
  5. Step 5: Solve for x
    x = 60,906.21/255.42
  6. Step 6: Final answer
    x = 238.46

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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.