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Finding the Third Proportional to 5,320 and 6,440

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Solution

The third proportional to 5,320 and 6,440 is: 7,795.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,320 : 6,440 = 6,440 : x
  2. Step 2: Convert to fraction form
    5,320/6,440 = 6,440/x
  3. Step 3: Cross multiply
    5,320x = 6,440 × 6,440
  4. Step 4: Simplify right side
    5,320x = 41,473,600
  5. Step 5: Solve for x
    x = 41,473,600/5,320
  6. Step 6: Final answer
    x = 7,795.79

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Why These Related Problems?

These problems maintain the same ratio (1.21) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.