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Finding the Third Proportional to 487 and 1,079

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Solution

The third proportional to 487 and 1,079 is: 2,390.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    487 : 1,079 = 1,079 : x
  2. Step 2: Convert to fraction form
    487/1,079 = 1,079/x
  3. Step 3: Cross multiply
    487x = 1,079 × 1,079
  4. Step 4: Simplify right side
    487x = 1,164,241
  5. Step 5: Solve for x
    x = 1,164,241/487
  6. Step 6: Final answer
    x = 2,390.64

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Why These Related Problems?

These problems maintain the same ratio (2.22) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.