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Finding the Third Proportional to 5,142 and 7,272

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Solution

The third proportional to 5,142 and 7,272 is: 10,284.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,142 : 7,272 = 7,272 : x
  2. Step 2: Convert to fraction form
    5,142/7,272 = 7,272/x
  3. Step 3: Cross multiply
    5,142x = 7,272 × 7,272
  4. Step 4: Simplify right side
    5,142x = 52,881,984
  5. Step 5: Solve for x
    x = 52,881,984/5,142
  6. Step 6: Final answer
    x = 10,284.32

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Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.