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Finding the Third Proportional to 78.75 and 147.75

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Solution

The third proportional to 78.75 and 147.75 is: 277.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.75 : 147.75 = 147.75 : x
  2. Step 2: Convert to fraction form
    78.75/147.75 = 147.75/x
  3. Step 3: Cross multiply
    78.75x = 147.75 × 147.75
  4. Step 4: Simplify right side
    78.75x = 21,830.06
  5. Step 5: Solve for x
    x = 21,830.06/78.75
  6. Step 6: Final answer
    x = 277.21

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Why These Related Problems?

These problems maintain the same ratio (1.88) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.