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Finding the Third Proportional to 147.25 and 316.88

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Solution

The third proportional to 147.25 and 316.88 is: 681.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.25 : 316.88 = 316.88 : x
  2. Step 2: Convert to fraction form
    147.25/316.88 = 316.88/x
  3. Step 3: Cross multiply
    147.25x = 316.88 × 316.88
  4. Step 4: Simplify right side
    147.25x = 100,409.77
  5. Step 5: Solve for x
    x = 100,409.77/147.25
  6. Step 6: Final answer
    x = 681.90

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.