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Finding the Third Proportional to 310.69 and 491.25

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Solution

The third proportional to 310.69 and 491.25 is: 776.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.69 : 491.25 = 491.25 : x
  2. Step 2: Convert to fraction form
    310.69/491.25 = 491.25/x
  3. Step 3: Cross multiply
    310.69x = 491.25 × 491.25
  4. Step 4: Simplify right side
    310.69x = 241,326.56
  5. Step 5: Solve for x
    x = 241,326.56/310.69
  6. Step 6: Final answer
    x = 776.75

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Why These Related Problems?

These problems maintain the same ratio (1.58) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.