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Finding the Fourth Proportional to 21,348.70, 32,003.85 and 13,956.70

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Solution

The fourth proportional to 21,348.70, 32,003.85 and 13,956.70 is: 20,922.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,348.70 : 32,003.85 = 13,956.70 : x
  2. Step 2: Convert to fraction form
    21,348.70/32,003.85 = 13,956.70/x
  3. Step 3: Cross multiply
    21,348.70x = 32,003.85 × 13,956.70
  4. Step 4: Simplify right side
    21,348.70x = 446,668,133.30
  5. Step 5: Solve for x
    x = 446,668,133.30/21,348.70
  6. Step 6: Final answer
    x = 20,922.50

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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.