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Finding the Third Proportional to 42,072 and 90,720

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Solution

The third proportional to 42,072 and 90,720 is: 195,619.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,072 : 90,720 = 90,720 : x
  2. Step 2: Convert to fraction form
    42,072/90,720 = 90,720/x
  3. Step 3: Cross multiply
    42,072x = 90,720 × 90,720
  4. Step 4: Simplify right side
    42,072x = 8,230,118,400
  5. Step 5: Solve for x
    x = 8,230,118,400/42,072
  6. Step 6: Final answer
    x = 195,619.85

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.