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Finding the Fourth Proportional to 255.60, 352.80 and 231

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Solution

The fourth proportional to 255.60, 352.80 and 231 is: 318.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.60 : 352.80 = 231 : x
  2. Step 2: Convert to fraction form
    255.60/352.80 = 231/x
  3. Step 3: Cross multiply
    255.60x = 352.80 × 231
  4. Step 4: Simplify right side
    255.60x = 81,496.80
  5. Step 5: Solve for x
    x = 81,496.80/255.60
  6. Step 6: Final answer
    x = 318.85

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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.