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Finding the Fourth Proportional to 20,363.76, 28,101.60 and 13,276.80

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Solution

The fourth proportional to 20,363.76, 28,101.60 and 13,276.80 is: 18,321.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,363.76 : 28,101.60 = 13,276.80 : x
  2. Step 2: Convert to fraction form
    20,363.76/28,101.60 = 13,276.80/x
  3. Step 3: Cross multiply
    20,363.76x = 28,101.60 × 13,276.80
  4. Step 4: Simplify right side
    20,363.76x = 373,099,322.88
  5. Step 5: Solve for x
    x = 373,099,322.88/20,363.76
  6. Step 6: Final answer
    x = 18,321.73

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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.