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Finding the Third Proportional to 310.75 and 491.63

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Solution

The third proportional to 310.75 and 491.63 is: 777.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.75 : 491.63 = 491.63 : x
  2. Step 2: Convert to fraction form
    310.75/491.63 = 491.63/x
  3. Step 3: Cross multiply
    310.75x = 491.63 × 491.63
  4. Step 4: Simplify right side
    310.75x = 241,695.14
  5. Step 5: Solve for x
    x = 241,695.14/310.75
  6. Step 6: Final answer
    x = 777.78

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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.