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Finding the Third Proportional to 16,831.50 and 18,411

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Solution

The third proportional to 16,831.50 and 18,411 is: 20,138.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    16,831.50 : 18,411 = 18,411 : x
  2. Step 2: Convert to fraction form
    16,831.50/18,411 = 18,411/x
  3. Step 3: Cross multiply
    16,831.50x = 18,411 × 18,411
  4. Step 4: Simplify right side
    16,831.50x = 338,964,921
  5. Step 5: Solve for x
    x = 338,964,921/16,831.50
  6. Step 6: Final answer
    x = 20,138.72

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.