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Finding the Third Proportional to 147.38 and 318.75

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Solution

The third proportional to 147.38 and 318.75 is: 689.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.38 : 318.75 = 318.75 : x
  2. Step 2: Convert to fraction form
    147.38/318.75 = 318.75/x
  3. Step 3: Cross multiply
    147.38x = 318.75 × 318.75
  4. Step 4: Simplify right side
    147.38x = 101,601.56
  5. Step 5: Solve for x
    x = 101,601.56/147.38
  6. Step 6: Final answer
    x = 689.41

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.