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Finding the Third Proportional to 5,640 and 6,486

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Solution

The third proportional to 5,640 and 6,486 is: 7,458.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,640 : 6,486 = 6,486 : x
  2. Step 2: Convert to fraction form
    5,640/6,486 = 6,486/x
  3. Step 3: Cross multiply
    5,640x = 6,486 × 6,486
  4. Step 4: Simplify right side
    5,640x = 42,068,196
  5. Step 5: Solve for x
    x = 42,068,196/5,640
  6. Step 6: Final answer
    x = 7,458.90

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Why These Related Problems?

These problems maintain the same ratio (1.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.