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Finding the Fourth Proportional to 21,699.92, 29,946.16 and 12,747.56

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Solution

The fourth proportional to 21,699.92, 29,946.16 and 12,747.56 is: 17,591.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,699.92 : 29,946.16 = 12,747.56 : x
  2. Step 2: Convert to fraction form
    21,699.92/29,946.16 = 12,747.56/x
  3. Step 3: Cross multiply
    21,699.92x = 29,946.16 × 12,747.56
  4. Step 4: Simplify right side
    21,699.92x = 381,740,471.37
  5. Step 5: Solve for x
    x = 381,740,471.37/21,699.92
  6. Step 6: Final answer
    x = 17,591.79

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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.