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Finding the Third Proportional to 640 and 755.50

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Solution

The third proportional to 640 and 755.50 is: 891.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    640 : 755.50 = 755.50 : x
  2. Step 2: Convert to fraction form
    640/755.50 = 755.50/x
  3. Step 3: Cross multiply
    640x = 755.50 × 755.50
  4. Step 4: Simplify right side
    640x = 570,780.25
  5. Step 5: Solve for x
    x = 570,780.25/640
  6. Step 6: Final answer
    x = 891.84

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Why These Related Problems?

These problems maintain the same ratio (1.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.