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Finding the Fourth Proportional to 231.88, 320.36 and 198.68

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Solution

The fourth proportional to 231.88, 320.36 and 198.68 is: 274.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.88 : 320.36 = 198.68 : x
  2. Step 2: Convert to fraction form
    231.88/320.36 = 198.68/x
  3. Step 3: Cross multiply
    231.88x = 320.36 × 198.68
  4. Step 4: Simplify right side
    231.88x = 63,649.12
  5. Step 5: Solve for x
    x = 63,649.12/231.88
  6. Step 6: Final answer
    x = 274.49

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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.