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Finding the Fourth Proportional to 255.71, 352.76 and 172.78

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Solution

The fourth proportional to 255.71, 352.76 and 172.78 is: 238.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.71 : 352.76 = 172.78 : x
  2. Step 2: Convert to fraction form
    255.71/352.76 = 172.78/x
  3. Step 3: Cross multiply
    255.71x = 352.76 × 172.78
  4. Step 4: Simplify right side
    255.71x = 60,950.42
  5. Step 5: Solve for x
    x = 60,950.42/255.71
  6. Step 6: Final answer
    x = 238.36

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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.