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Finding the Third Proportional to 5,278 and 7,440

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Solution

The third proportional to 5,278 and 7,440 is: 10,487.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,278 : 7,440 = 7,440 : x
  2. Step 2: Convert to fraction form
    5,278/7,440 = 7,440/x
  3. Step 3: Cross multiply
    5,278x = 7,440 × 7,440
  4. Step 4: Simplify right side
    5,278x = 55,353,600
  5. Step 5: Solve for x
    x = 55,353,600/5,278
  6. Step 6: Final answer
    x = 10,487.61

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Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.