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Finding the Fourth Proportional to 13,861.80, 20,792.70 and 7,956.90

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Solution

The fourth proportional to 13,861.80, 20,792.70 and 7,956.90 is: 11,935.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,861.80 : 20,792.70 = 7,956.90 : x
  2. Step 2: Convert to fraction form
    13,861.80/20,792.70 = 7,956.90/x
  3. Step 3: Cross multiply
    13,861.80x = 20,792.70 × 7,956.90
  4. Step 4: Simplify right side
    13,861.80x = 165,445,434.63
  5. Step 5: Solve for x
    x = 165,445,434.63/13,861.80
  6. Step 6: Final answer
    x = 11,935.35

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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.