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Finding the Third Proportional to 805 and 872.50

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Solution

The third proportional to 805 and 872.50 is: 945.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    805 : 872.50 = 872.50 : x
  2. Step 2: Convert to fraction form
    805/872.50 = 872.50/x
  3. Step 3: Cross multiply
    805x = 872.50 × 872.50
  4. Step 4: Simplify right side
    805x = 761,256.25
  5. Step 5: Solve for x
    x = 761,256.25/805
  6. Step 6: Final answer
    x = 945.66

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Why These Related Problems?

These problems maintain the same ratio (1.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.