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Finding the Fourth Proportional to 12,760.56, 17,611.20 and 7,171.56

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Solution

The fourth proportional to 12,760.56, 17,611.20 and 7,171.56 is: 9,897.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,760.56 : 17,611.20 = 7,171.56 : x
  2. Step 2: Convert to fraction form
    12,760.56/17,611.20 = 7,171.56/x
  3. Step 3: Cross multiply
    12,760.56x = 17,611.20 × 7,171.56
  4. Step 4: Simplify right side
    12,760.56x = 126,299,777.47
  5. Step 5: Solve for x
    x = 126,299,777.47/12,760.56
  6. Step 6: Final answer
    x = 9,897.67

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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.