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Finding the Fourth Proportional to 255.42, 352.38 and 155.81

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Solution

The fourth proportional to 255.42, 352.38 and 155.81 is: 214.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.42 : 352.38 = 155.81 : x
  2. Step 2: Convert to fraction form
    255.42/352.38 = 155.81/x
  3. Step 3: Cross multiply
    255.42x = 352.38 × 155.81
  4. Step 4: Simplify right side
    255.42x = 54,903.55
  5. Step 5: Solve for x
    x = 54,903.55/255.42
  6. Step 6: Final answer
    x = 214.95

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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.