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Finding the Third Proportional to 231.25 and 312

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Solution

The third proportional to 231.25 and 312 is: 420.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.25 : 312 = 312 : x
  2. Step 2: Convert to fraction form
    231.25/312 = 312/x
  3. Step 3: Cross multiply
    231.25x = 312 × 312
  4. Step 4: Simplify right side
    231.25x = 97,344
  5. Step 5: Solve for x
    x = 97,344/231.25
  6. Step 6: Final answer
    x = 420.95

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These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.