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Finding the Third Proportional to 157.78 and 339.19

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Solution

The third proportional to 157.78 and 339.19 is: 729.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.78 : 339.19 = 339.19 : x
  2. Step 2: Convert to fraction form
    157.78/339.19 = 339.19/x
  3. Step 3: Cross multiply
    157.78x = 339.19 × 339.19
  4. Step 4: Simplify right side
    157.78x = 115,048.16
  5. Step 5: Solve for x
    x = 115,048.16/157.78
  6. Step 6: Final answer
    x = 729.16

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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.