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Finding the Third Proportional to 872.50 and 1,153

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Solution

The third proportional to 872.50 and 1,153 is: 1,523.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.50 : 1,153 = 1,153 : x
  2. Step 2: Convert to fraction form
    872.50/1,153 = 1,153/x
  3. Step 3: Cross multiply
    872.50x = 1,153 × 1,153
  4. Step 4: Simplify right side
    872.50x = 1,329,409
  5. Step 5: Solve for x
    x = 1,329,409/872.50
  6. Step 6: Final answer
    x = 1,523.68

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Why These Related Problems?

These problems maintain the same ratio (1.32) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.