Home / 21,160.26-31,742.76-8,679.78

Finding the Fourth Proportional to 21,160.26, 31,742.76 and 8,679.78

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Solution

The fourth proportional to 21,160.26, 31,742.76 and 8,679.78 is: 13,020.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,160.26 : 31,742.76 = 8,679.78 : x
  2. Step 2: Convert to fraction form
    21,160.26/31,742.76 = 8,679.78/x
  3. Step 3: Cross multiply
    21,160.26x = 31,742.76 × 8,679.78
  4. Step 4: Simplify right side
    21,160.26x = 275,520,173.39
  5. Step 5: Solve for x
    x = 275,520,173.39/21,160.26
  6. Step 6: Final answer
    x = 13,020.64

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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.