Home / 13,431.76-20,134.14-5,109.64

Finding the Fourth Proportional to 13,431.76, 20,134.14 and 5,109.64

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Solution

The fourth proportional to 13,431.76, 20,134.14 and 5,109.64 is: 7,659.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,431.76 : 20,134.14 = 5,109.64 : x
  2. Step 2: Convert to fraction form
    13,431.76/20,134.14 = 5,109.64/x
  3. Step 3: Cross multiply
    13,431.76x = 20,134.14 × 5,109.64
  4. Step 4: Simplify right side
    13,431.76x = 102,878,207.11
  5. Step 5: Solve for x
    x = 102,878,207.11/13,431.76
  6. Step 6: Final answer
    x = 7,659.32

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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.