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Finding the Third Proportional to 153.19 and 321.56

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Solution

The third proportional to 153.19 and 321.56 is: 675.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.19 : 321.56 = 321.56 : x
  2. Step 2: Convert to fraction form
    153.19/321.56 = 321.56/x
  3. Step 3: Cross multiply
    153.19x = 321.56 × 321.56
  4. Step 4: Simplify right side
    153.19x = 103,402.44
  5. Step 5: Solve for x
    x = 103,402.44/153.19
  6. Step 6: Final answer
    x = 675.01

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Why These Related Problems?

These problems maintain the same ratio (2.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.