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Finding the Third Proportional to 56,128 and 66,400

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Solution

The third proportional to 56,128 and 66,400 is: 78,551.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,128 : 66,400 = 66,400 : x
  2. Step 2: Convert to fraction form
    56,128/66,400 = 66,400/x
  3. Step 3: Cross multiply
    56,128x = 66,400 × 66,400
  4. Step 4: Simplify right side
    56,128x = 4,408,960,000
  5. Step 5: Solve for x
    x = 4,408,960,000/56,128
  6. Step 6: Final answer
    x = 78,551.88

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Why These Related Problems?

These problems maintain the same ratio (1.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.