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Finding the Third Proportional to 310.88 and 718.69

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Solution

The third proportional to 310.88 and 718.69 is: 1,661.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.88 : 718.69 = 718.69 : x
  2. Step 2: Convert to fraction form
    310.88/718.69 = 718.69/x
  3. Step 3: Cross multiply
    310.88x = 718.69 × 718.69
  4. Step 4: Simplify right side
    310.88x = 516,511.72
  5. Step 5: Solve for x
    x = 516,511.72/310.88
  6. Step 6: Final answer
    x = 1,661.48

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Why These Related Problems?

These problems maintain the same ratio (2.31) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.