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Finding the Fourth Proportional to 21,999.78, 30,356.79 and 12,440.96

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Solution

The fourth proportional to 21,999.78, 30,356.79 and 12,440.96 is: 17,166.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,999.78 : 30,356.79 = 12,440.96 : x
  2. Step 2: Convert to fraction form
    21,999.78/30,356.79 = 12,440.96/x
  3. Step 3: Cross multiply
    21,999.78x = 30,356.79 × 12,440.96
  4. Step 4: Simplify right side
    21,999.78x = 377,667,610.12
  5. Step 5: Solve for x
    x = 377,667,610.12/21,999.78
  6. Step 6: Final answer
    x = 17,166.88

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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.