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Finding the Third Proportional to 7,128 and 9,388

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Solution

The third proportional to 7,128 and 9,388 is: 12,364.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,128 : 9,388 = 9,388 : x
  2. Step 2: Convert to fraction form
    7,128/9,388 = 9,388/x
  3. Step 3: Cross multiply
    7,128x = 9,388 × 9,388
  4. Step 4: Simplify right side
    7,128x = 88,134,544
  5. Step 5: Solve for x
    x = 88,134,544/7,128
  6. Step 6: Final answer
    x = 12,364.55

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Why These Related Problems?

These problems maintain the same ratio (1.32) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.