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Finding the Third Proportional to 717.19 and 1,290.09

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Solution

The third proportional to 717.19 and 1,290.09 is: 2,320.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.19 : 1,290.09 = 1,290.09 : x
  2. Step 2: Convert to fraction form
    717.19/1,290.09 = 1,290.09/x
  3. Step 3: Cross multiply
    717.19x = 1,290.09 × 1,290.09
  4. Step 4: Simplify right side
    717.19x = 1,664,341.88
  5. Step 5: Solve for x
    x = 1,664,341.88/717.19
  6. Step 6: Final answer
    x = 2,320.65

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Why These Related Problems?

These problems maintain the same ratio (1.80) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.