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Finding the Third Proportional to 3,840 and 4,272

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Solution

The third proportional to 3,840 and 4,272 is: 4,752.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,840 : 4,272 = 4,272 : x
  2. Step 2: Convert to fraction form
    3,840/4,272 = 4,272/x
  3. Step 3: Cross multiply
    3,840x = 4,272 × 4,272
  4. Step 4: Simplify right side
    3,840x = 18,249,984
  5. Step 5: Solve for x
    x = 18,249,984/3,840
  6. Step 6: Final answer
    x = 4,752.60

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Why These Related Problems?

These problems maintain the same ratio (1.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.