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Finding the Third Proportional to 6,390 and 8,587.50

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Solution

The third proportional to 6,390 and 8,587.50 is: 11,540.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,390 : 8,587.50 = 8,587.50 : x
  2. Step 2: Convert to fraction form
    6,390/8,587.50 = 8,587.50/x
  3. Step 3: Cross multiply
    6,390x = 8,587.50 × 8,587.50
  4. Step 4: Simplify right side
    6,390x = 73,745,156.25
  5. Step 5: Solve for x
    x = 73,745,156.25/6,390
  6. Step 6: Final answer
    x = 11,540.71

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Why These Related Problems?

These problems maintain the same ratio (1.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.