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Finding the Third Proportional to 865.13 and 920.81

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Solution

The third proportional to 865.13 and 920.81 is: 980.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.13 : 920.81 = 920.81 : x
  2. Step 2: Convert to fraction form
    865.13/920.81 = 920.81/x
  3. Step 3: Cross multiply
    865.13x = 920.81 × 920.81
  4. Step 4: Simplify right side
    865.13x = 847,895.66
  5. Step 5: Solve for x
    x = 847,895.66/865.13
  6. Step 6: Final answer
    x = 980.08

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Why These Related Problems?

These problems maintain the same ratio (1.06) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.