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Finding the Fourth Proportional to 21,951.72, 30,293.82 and 12,999.06

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Solution

The fourth proportional to 21,951.72, 30,293.82 and 12,999.06 is: 17,938.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,951.72 : 30,293.82 = 12,999.06 : x
  2. Step 2: Convert to fraction form
    21,951.72/30,293.82 = 12,999.06/x
  3. Step 3: Cross multiply
    21,951.72x = 30,293.82 × 12,999.06
  4. Step 4: Simplify right side
    21,951.72x = 393,791,183.81
  5. Step 5: Solve for x
    x = 393,791,183.81/21,951.72
  6. Step 6: Final answer
    x = 17,938.97

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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.