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Finding the Fourth Proportional to 12,857.79, 17,742.92 and 7,191.56

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Solution

The fourth proportional to 12,857.79, 17,742.92 and 7,191.56 is: 9,923.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,857.79 : 17,742.92 = 7,191.56 : x
  2. Step 2: Convert to fraction form
    12,857.79/17,742.92 = 7,191.56/x
  3. Step 3: Cross multiply
    12,857.79x = 17,742.92 × 7,191.56
  4. Step 4: Simplify right side
    12,857.79x = 127,599,149.08
  5. Step 5: Solve for x
    x = 127,599,149.08/12,857.79
  6. Step 6: Final answer
    x = 9,923.88

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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.