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Finding the Third Proportional to 153 and 313.31

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Solution

The third proportional to 153 and 313.31 is: 641.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    153 : 313.31 = 313.31 : x
  2. Step 2: Convert to fraction form
    153/313.31 = 313.31/x
  3. Step 3: Cross multiply
    153x = 313.31 × 313.31
  4. Step 4: Simplify right side
    153x = 98,164.72
  5. Step 5: Solve for x
    x = 98,164.72/153
  6. Step 6: Final answer
    x = 641.60

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Why These Related Problems?

These problems maintain the same ratio (2.05) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.