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Finding the Third Proportional to 729.75 and 985.75

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Solution

The third proportional to 729.75 and 985.75 is: 1,331.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    729.75 : 985.75 = 985.75 : x
  2. Step 2: Convert to fraction form
    729.75/985.75 = 985.75/x
  3. Step 3: Cross multiply
    729.75x = 985.75 × 985.75
  4. Step 4: Simplify right side
    729.75x = 971,703.06
  5. Step 5: Solve for x
    x = 971,703.06/729.75
  6. Step 6: Final answer
    x = 1,331.56

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.