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Finding the Fourth Proportional to 13,809.70, 20,738.85 and 13,372.30

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Solution

The fourth proportional to 13,809.70, 20,738.85 and 13,372.30 is: 20,081.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,809.70 : 20,738.85 = 13,372.30 : x
  2. Step 2: Convert to fraction form
    13,809.70/20,738.85 = 13,372.30/x
  3. Step 3: Cross multiply
    13,809.70x = 20,738.85 × 13,372.30
  4. Step 4: Simplify right side
    13,809.70x = 277,326,123.86
  5. Step 5: Solve for x
    x = 277,326,123.86/13,809.70
  6. Step 6: Final answer
    x = 20,081.98

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1.5x scale

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.