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Finding the Fourth Proportional to 20,363.86, 28,103.86 and 11,411.24

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Solution

The fourth proportional to 20,363.86, 28,103.86 and 11,411.24 is: 15,748.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,363.86 : 28,103.86 = 11,411.24 : x
  2. Step 2: Convert to fraction form
    20,363.86/28,103.86 = 11,411.24/x
  3. Step 3: Cross multiply
    20,363.86x = 28,103.86 × 11,411.24
  4. Step 4: Simplify right side
    20,363.86x = 320,699,891.39
  5. Step 5: Solve for x
    x = 320,699,891.39/20,363.86
  6. Step 6: Final answer
    x = 15,748.48

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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.