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Finding the Third Proportional to 5,428 and 7,212

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Solution

The third proportional to 5,428 and 7,212 is: 9,582.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,428 : 7,212 = 7,212 : x
  2. Step 2: Convert to fraction form
    5,428/7,212 = 7,212/x
  3. Step 3: Cross multiply
    5,428x = 7,212 × 7,212
  4. Step 4: Simplify right side
    5,428x = 52,012,944
  5. Step 5: Solve for x
    x = 52,012,944/5,428
  6. Step 6: Final answer
    x = 9,582.34

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Why These Related Problems?

These problems maintain the same ratio (1.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.