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Finding the Fourth Proportional to 255.60, 381.21 and 229.68

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Solution

The fourth proportional to 255.60, 381.21 and 229.68 is: 342.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.60 : 381.21 = 229.68 : x
  2. Step 2: Convert to fraction form
    255.60/381.21 = 229.68/x
  3. Step 3: Cross multiply
    255.60x = 381.21 × 229.68
  4. Step 4: Simplify right side
    255.60x = 87,556.31
  5. Step 5: Solve for x
    x = 87,556.31/255.60
  6. Step 6: Final answer
    x = 342.55

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.