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Finding the Third Proportional to 905 and 1,355.50

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Solution

The third proportional to 905 and 1,355.50 is: 2,030.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    905 : 1,355.50 = 1,355.50 : x
  2. Step 2: Convert to fraction form
    905/1,355.50 = 1,355.50/x
  3. Step 3: Cross multiply
    905x = 1,355.50 × 1,355.50
  4. Step 4: Simplify right side
    905x = 1,837,380.25
  5. Step 5: Solve for x
    x = 1,837,380.25/905
  6. Step 6: Final answer
    x = 2,030.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.