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Finding the Fourth Proportional to 21,861, 30,163.32 and 12,908.88

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Solution

The fourth proportional to 21,861, 30,163.32 and 12,908.88 is: 17,811.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,861 : 30,163.32 = 12,908.88 : x
  2. Step 2: Convert to fraction form
    21,861/30,163.32 = 12,908.88/x
  3. Step 3: Cross multiply
    21,861x = 30,163.32 × 12,908.88
  4. Step 4: Simplify right side
    21,861x = 389,374,678.28
  5. Step 5: Solve for x
    x = 389,374,678.28/21,861
  6. Step 6: Final answer
    x = 17,811.38

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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.