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Finding the Fourth Proportional to 13,141.92, 18,135.78 and 7,173.64

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Solution

The fourth proportional to 13,141.92, 18,135.78 and 7,173.64 is: 9,899.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,141.92 : 18,135.78 = 7,173.64 : x
  2. Step 2: Convert to fraction form
    13,141.92/18,135.78 = 7,173.64/x
  3. Step 3: Cross multiply
    13,141.92x = 18,135.78 × 7,173.64
  4. Step 4: Simplify right side
    13,141.92x = 130,099,556.84
  5. Step 5: Solve for x
    x = 130,099,556.84/13,141.92
  6. Step 6: Final answer
    x = 9,899.59

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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.