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Finding the Fourth Proportional to 255.56, 352.78 and 157.32

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Solution

The fourth proportional to 255.56, 352.78 and 157.32 is: 217.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.56 : 352.78 = 157.32 : x
  2. Step 2: Convert to fraction form
    255.56/352.78 = 157.32/x
  3. Step 3: Cross multiply
    255.56x = 352.78 × 157.32
  4. Step 4: Simplify right side
    255.56x = 55,499.35
  5. Step 5: Solve for x
    x = 55,499.35/255.56
  6. Step 6: Final answer
    x = 217.17

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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.