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Finding the Fourth Proportional to 231.30, 318.78 and 181.98

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Solution

The fourth proportional to 231.30, 318.78 and 181.98 is: 250.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.30 : 318.78 = 181.98 : x
  2. Step 2: Convert to fraction form
    231.30/318.78 = 181.98/x
  3. Step 3: Cross multiply
    231.30x = 318.78 × 181.98
  4. Step 4: Simplify right side
    231.30x = 58,011.58
  5. Step 5: Solve for x
    x = 58,011.58/231.30
  6. Step 6: Final answer
    x = 250.81

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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.