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Finding the Fourth Proportional to 13,970.87, 20,956.23 and 3,440.87

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Solution

The fourth proportional to 13,970.87, 20,956.23 and 3,440.87 is: 5,161.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,970.87 : 20,956.23 = 3,440.87 : x
  2. Step 2: Convert to fraction form
    13,970.87/20,956.23 = 3,440.87/x
  3. Step 3: Cross multiply
    13,970.87x = 20,956.23 × 3,440.87
  4. Step 4: Simplify right side
    13,970.87x = 72,107,558.34
  5. Step 5: Solve for x
    x = 72,107,558.34/13,970.87
  6. Step 6: Final answer
    x = 5,161.28

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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.