Home / 20,911.45-28,856.49-11,479.96

Finding the Fourth Proportional to 20,911.45, 28,856.49 and 11,479.96

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Solution

The fourth proportional to 20,911.45, 28,856.49 and 11,479.96 is: 15,841.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,911.45 : 28,856.49 = 11,479.96 : x
  2. Step 2: Convert to fraction form
    20,911.45/28,856.49 = 11,479.96/x
  3. Step 3: Cross multiply
    20,911.45x = 28,856.49 × 11,479.96
  4. Step 4: Simplify right side
    20,911.45x = 331,271,350.94
  5. Step 5: Solve for x
    x = 331,271,350.94/20,911.45
  6. Step 6: Final answer
    x = 15,841.63

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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.