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Finding the Fourth Proportional to 13,745.71, 20,618.57 and 7,898.59

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Solution

The fourth proportional to 13,745.71, 20,618.57 and 7,898.59 is: 11,847.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,745.71 : 20,618.57 = 7,898.59 : x
  2. Step 2: Convert to fraction form
    13,745.71/20,618.57 = 7,898.59/x
  3. Step 3: Cross multiply
    13,745.71x = 20,618.57 × 7,898.59
  4. Step 4: Simplify right side
    13,745.71x = 162,857,630.82
  5. Step 5: Solve for x
    x = 162,857,630.82/13,745.71
  6. Step 6: Final answer
    x = 11,847.89

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Similar ratio
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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.