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Finding the Fourth Proportional to 255.20, 382.38 and 146.80

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Solution

The fourth proportional to 255.20, 382.38 and 146.80 is: 219.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.20 : 382.38 = 146.80 : x
  2. Step 2: Convert to fraction form
    255.20/382.38 = 146.80/x
  3. Step 3: Cross multiply
    255.20x = 382.38 × 146.80
  4. Step 4: Simplify right side
    255.20x = 56,133.38
  5. Step 5: Solve for x
    x = 56,133.38/255.20
  6. Step 6: Final answer
    x = 219.96

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.