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Finding the Fourth Proportional to 225.78, 311.75 and 143.02

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Solution

The fourth proportional to 225.78, 311.75 and 143.02 is: 197.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    225.78 : 311.75 = 143.02 : x
  2. Step 2: Convert to fraction form
    225.78/311.75 = 143.02/x
  3. Step 3: Cross multiply
    225.78x = 311.75 × 143.02
  4. Step 4: Simplify right side
    225.78x = 44,586.49
  5. Step 5: Solve for x
    x = 44,586.49/225.78
  6. Step 6: Final answer
    x = 197.48

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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.