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Finding the Third Proportional to 78 and 93.75

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Solution

The third proportional to 78 and 93.75 is: 112.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    78 : 93.75 = 93.75 : x
  2. Step 2: Convert to fraction form
    78/93.75 = 93.75/x
  3. Step 3: Cross multiply
    78x = 93.75 × 93.75
  4. Step 4: Simplify right side
    78x = 8,789.06
  5. Step 5: Solve for x
    x = 8,789.06/78
  6. Step 6: Final answer
    x = 112.68

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These problems maintain the same ratio (1.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.