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Finding the Fourth Proportional to 231.32, 319.22 and 127.80

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Solution

The fourth proportional to 231.32, 319.22 and 127.80 is: 176.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.32 : 319.22 = 127.80 : x
  2. Step 2: Convert to fraction form
    231.32/319.22 = 127.80/x
  3. Step 3: Cross multiply
    231.32x = 319.22 × 127.80
  4. Step 4: Simplify right side
    231.32x = 40,796.32
  5. Step 5: Solve for x
    x = 40,796.32/231.32
  6. Step 6: Final answer
    x = 176.36

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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.