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Finding the Third Proportional to 287.50 and 656.75

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Solution

The third proportional to 287.50 and 656.75 is: 1,500.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.50 : 656.75 = 656.75 : x
  2. Step 2: Convert to fraction form
    287.50/656.75 = 656.75/x
  3. Step 3: Cross multiply
    287.50x = 656.75 × 656.75
  4. Step 4: Simplify right side
    287.50x = 431,320.56
  5. Step 5: Solve for x
    x = 431,320.56/287.50
  6. Step 6: Final answer
    x = 1,500.25

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Why These Related Problems?

These problems maintain the same ratio (2.28) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.