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Finding the Third Proportional to 717.61 and 973.90

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Solution

The third proportional to 717.61 and 973.90 is: 1,321.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.61 : 973.90 = 973.90 : x
  2. Step 2: Convert to fraction form
    717.61/973.90 = 973.90/x
  3. Step 3: Cross multiply
    717.61x = 973.90 × 973.90
  4. Step 4: Simplify right side
    717.61x = 948,478.17
  5. Step 5: Solve for x
    x = 948,478.17/717.61
  6. Step 6: Final answer
    x = 1,321.72

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.