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Finding the Fourth Proportional to 255.76, 352.78 and 157.42

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Solution

The fourth proportional to 255.76, 352.78 and 157.42 is: 217.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.76 : 352.78 = 157.42 : x
  2. Step 2: Convert to fraction form
    255.76/352.78 = 157.42/x
  3. Step 3: Cross multiply
    255.76x = 352.78 × 157.42
  4. Step 4: Simplify right side
    255.76x = 55,534.63
  5. Step 5: Solve for x
    x = 55,534.63/255.76
  6. Step 6: Final answer
    x = 217.14

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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.