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Finding the Fourth Proportional to 13,956.40, 20,938.02 and 6,939.72

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Solution

The fourth proportional to 13,956.40, 20,938.02 and 6,939.72 is: 10,411.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,956.40 : 20,938.02 = 6,939.72 : x
  2. Step 2: Convert to fraction form
    13,956.40/20,938.02 = 6,939.72/x
  3. Step 3: Cross multiply
    13,956.40x = 20,938.02 × 6,939.72
  4. Step 4: Simplify right side
    13,956.40x = 145,303,996.15
  5. Step 5: Solve for x
    x = 145,303,996.15/13,956.40
  6. Step 6: Final answer
    x = 10,411.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.