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Finding the Third Proportional to 153.75 and 320.50

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Solution

The third proportional to 153.75 and 320.50 is: 668.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.75 : 320.50 = 320.50 : x
  2. Step 2: Convert to fraction form
    153.75/320.50 = 320.50/x
  3. Step 3: Cross multiply
    153.75x = 320.50 × 320.50
  4. Step 4: Simplify right side
    153.75x = 102,720.25
  5. Step 5: Solve for x
    x = 102,720.25/153.75
  6. Step 6: Final answer
    x = 668.10

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Why These Related Problems?

These problems maintain the same ratio (2.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.