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Finding the Third Proportional to 69,372 and 99,128

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Solution

The third proportional to 69,372 and 99,128 is: 141,647.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,372 : 99,128 = 99,128 : x
  2. Step 2: Convert to fraction form
    69,372/99,128 = 99,128/x
  3. Step 3: Cross multiply
    69,372x = 99,128 × 99,128
  4. Step 4: Simplify right side
    69,372x = 9,826,360,384
  5. Step 5: Solve for x
    x = 9,826,360,384/69,372
  6. Step 6: Final answer
    x = 141,647.36

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Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.