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Finding the Fourth Proportional to 21,792.40, 30,072.68 and 11,856.40

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Solution

The fourth proportional to 21,792.40, 30,072.68 and 11,856.40 is: 16,361.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,792.40 : 30,072.68 = 11,856.40 : x
  2. Step 2: Convert to fraction form
    21,792.40/30,072.68 = 11,856.40/x
  3. Step 3: Cross multiply
    21,792.40x = 30,072.68 × 11,856.40
  4. Step 4: Simplify right side
    21,792.40x = 356,553,723.15
  5. Step 5: Solve for x
    x = 356,553,723.15/21,792.40
  6. Step 6: Final answer
    x = 16,361.38

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.