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Finding the Fourth Proportional to 255.34, 352.31 and 155.72

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Solution

The fourth proportional to 255.34, 352.31 and 155.72 is: 214.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.34 : 352.31 = 155.72 : x
  2. Step 2: Convert to fraction form
    255.34/352.31 = 155.72/x
  3. Step 3: Cross multiply
    255.34x = 352.31 × 155.72
  4. Step 4: Simplify right side
    255.34x = 54,861.71
  5. Step 5: Solve for x
    x = 54,861.71/255.34
  6. Step 6: Final answer
    x = 214.86

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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.