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Finding the Third Proportional to 12,856 and 15,556

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Solution

The third proportional to 12,856 and 15,556 is: 18,823.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,856 : 15,556 = 15,556 : x
  2. Step 2: Convert to fraction form
    12,856/15,556 = 15,556/x
  3. Step 3: Cross multiply
    12,856x = 15,556 × 15,556
  4. Step 4: Simplify right side
    12,856x = 241,989,136
  5. Step 5: Solve for x
    x = 241,989,136/12,856
  6. Step 6: Final answer
    x = 18,823.05

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Why These Related Problems?

These problems maintain the same ratio (1.21) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.