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Finding the Third Proportional to 13,515 and 31,575

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Solution

The third proportional to 13,515 and 31,575 is: 73,768.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,515 : 31,575 = 31,575 : x
  2. Step 2: Convert to fraction form
    13,515/31,575 = 31,575/x
  3. Step 3: Cross multiply
    13,515x = 31,575 × 31,575
  4. Step 4: Simplify right side
    13,515x = 996,980,625
  5. Step 5: Solve for x
    x = 996,980,625/13,515
  6. Step 6: Final answer
    x = 73,768.45

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Why These Related Problems?

These problems maintain the same ratio (2.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.