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Finding the Fourth Proportional to 21,999.40, 30,360.90 and 12,571

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Solution

The fourth proportional to 21,999.40, 30,360.90 and 12,571 is: 17,348.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,999.40 : 30,360.90 = 12,571 : x
  2. Step 2: Convert to fraction form
    21,999.40/30,360.90 = 12,571/x
  3. Step 3: Cross multiply
    21,999.40x = 30,360.90 × 12,571
  4. Step 4: Simplify right side
    21,999.40x = 381,666,873.90
  5. Step 5: Solve for x
    x = 381,666,873.90/21,999.40
  6. Step 6: Final answer
    x = 17,348.97

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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.