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Finding the Third Proportional to 642.50 and 901.75

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Solution

The third proportional to 642.50 and 901.75 is: 1,265.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.50 : 901.75 = 901.75 : x
  2. Step 2: Convert to fraction form
    642.50/901.75 = 901.75/x
  3. Step 3: Cross multiply
    642.50x = 901.75 × 901.75
  4. Step 4: Simplify right side
    642.50x = 813,153.06
  5. Step 5: Solve for x
    x = 813,153.06/642.50
  6. Step 6: Final answer
    x = 1,265.61

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.