Home / 20,979.76-28,941.96-13,031.24

Finding the Fourth Proportional to 20,979.76, 28,941.96 and 13,031.24

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Solution

The fourth proportional to 20,979.76, 28,941.96 and 13,031.24 is: 17,976.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,979.76 : 28,941.96 = 13,031.24 : x
  2. Step 2: Convert to fraction form
    20,979.76/28,941.96 = 13,031.24/x
  3. Step 3: Cross multiply
    20,979.76x = 28,941.96 × 13,031.24
  4. Step 4: Simplify right side
    20,979.76x = 377,149,626.83
  5. Step 5: Solve for x
    x = 377,149,626.83/20,979.76
  6. Step 6: Final answer
    x = 17,976.83

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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.