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Finding the Third Proportional to 5,580 and 6,390

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Solution

The third proportional to 5,580 and 6,390 is: 7,317.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,580 : 6,390 = 6,390 : x
  2. Step 2: Convert to fraction form
    5,580/6,390 = 6,390/x
  3. Step 3: Cross multiply
    5,580x = 6,390 × 6,390
  4. Step 4: Simplify right side
    5,580x = 40,832,100
  5. Step 5: Solve for x
    x = 40,832,100/5,580
  6. Step 6: Final answer
    x = 7,317.58

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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.