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Finding the Third Proportional to 830.75 and 920.75

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Solution

The third proportional to 830.75 and 920.75 is: 1,020.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.75 : 920.75 = 920.75 : x
  2. Step 2: Convert to fraction form
    830.75/920.75 = 920.75/x
  3. Step 3: Cross multiply
    830.75x = 920.75 × 920.75
  4. Step 4: Simplify right side
    830.75x = 847,780.56
  5. Step 5: Solve for x
    x = 847,780.56/830.75
  6. Step 6: Final answer
    x = 1,020.50

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Why These Related Problems?

These problems maintain the same ratio (1.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.