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Finding the Third Proportional to 310.50 and 487.13

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Solution

The third proportional to 310.50 and 487.13 is: 764.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.50 : 487.13 = 487.13 : x
  2. Step 2: Convert to fraction form
    310.50/487.13 = 487.13/x
  3. Step 3: Cross multiply
    310.50x = 487.13 × 487.13
  4. Step 4: Simplify right side
    310.50x = 237,290.77
  5. Step 5: Solve for x
    x = 237,290.77/310.50
  6. Step 6: Final answer
    x = 764.22

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.