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Finding the Third Proportional to 487.69 and 739.69

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Solution

The third proportional to 487.69 and 739.69 is: 1,121.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.69 : 739.69 = 739.69 : x
  2. Step 2: Convert to fraction form
    487.69/739.69 = 739.69/x
  3. Step 3: Cross multiply
    487.69x = 739.69 × 739.69
  4. Step 4: Simplify right side
    487.69x = 547,137.60
  5. Step 5: Solve for x
    x = 547,137.60/487.69
  6. Step 6: Final answer
    x = 1,121.90

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.