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Finding the Fourth Proportional to 231.73, 319.78 and 126.80

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Solution

The fourth proportional to 231.73, 319.78 and 126.80 is: 174.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.73 : 319.78 = 126.80 : x
  2. Step 2: Convert to fraction form
    231.73/319.78 = 126.80/x
  3. Step 3: Cross multiply
    231.73x = 319.78 × 126.80
  4. Step 4: Simplify right side
    231.73x = 40,547.87
  5. Step 5: Solve for x
    x = 40,547.87/231.73
  6. Step 6: Final answer
    x = 174.98

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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.