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Finding the Fourth Proportional to 12,861.39, 17,756.46 and 8,392.89

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Solution

The fourth proportional to 12,861.39, 17,756.46 and 8,392.89 is: 11,587.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,861.39 : 17,756.46 = 8,392.89 : x
  2. Step 2: Convert to fraction form
    12,861.39/17,756.46 = 8,392.89/x
  3. Step 3: Cross multiply
    12,861.39x = 17,756.46 × 8,392.89
  4. Step 4: Simplify right side
    12,861.39x = 149,028,015.57
  5. Step 5: Solve for x
    x = 149,028,015.57/12,861.39
  6. Step 6: Final answer
    x = 11,587.24

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.