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Finding the Third Proportional to 811.58 and 1,240.79

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Solution

The third proportional to 811.58 and 1,240.79 is: 1,896.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.58 : 1,240.79 = 1,240.79 : x
  2. Step 2: Convert to fraction form
    811.58/1,240.79 = 1,240.79/x
  3. Step 3: Cross multiply
    811.58x = 1,240.79 × 1,240.79
  4. Step 4: Simplify right side
    811.58x = 1,539,552.65
  5. Step 5: Solve for x
    x = 1,539,552.65/811.58
  6. Step 6: Final answer
    x = 1,896.98

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.