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Finding the Third Proportional to 855.50 and 1,242.50

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Solution

The third proportional to 855.50 and 1,242.50 is: 1,804.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.50 : 1,242.50 = 1,242.50 : x
  2. Step 2: Convert to fraction form
    855.50/1,242.50 = 1,242.50/x
  3. Step 3: Cross multiply
    855.50x = 1,242.50 × 1,242.50
  4. Step 4: Simplify right side
    855.50x = 1,543,806.25
  5. Step 5: Solve for x
    x = 1,543,806.25/855.50
  6. Step 6: Final answer
    x = 1,804.57

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Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.