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Finding the Fourth Proportional to 21,999.75, 30,359.79 and 12,573.78

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Solution

The fourth proportional to 21,999.75, 30,359.79 and 12,573.78 is: 17,351.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,999.75 : 30,359.79 = 12,573.78 : x
  2. Step 2: Convert to fraction form
    21,999.75/30,359.79 = 12,573.78/x
  3. Step 3: Cross multiply
    21,999.75x = 30,359.79 × 12,573.78
  4. Step 4: Simplify right side
    21,999.75x = 381,737,320.31
  5. Step 5: Solve for x
    x = 381,737,320.31/21,999.75
  6. Step 6: Final answer
    x = 17,351.89

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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.