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Finding the Fourth Proportional to 20,652.20, 28,499.62 and 11,221

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Solution

The fourth proportional to 20,652.20, 28,499.62 and 11,221 is: 15,484.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,652.20 : 28,499.62 = 11,221 : x
  2. Step 2: Convert to fraction form
    20,652.20/28,499.62 = 11,221/x
  3. Step 3: Cross multiply
    20,652.20x = 28,499.62 × 11,221
  4. Step 4: Simplify right side
    20,652.20x = 319,794,236.02
  5. Step 5: Solve for x
    x = 319,794,236.02/20,652.20
  6. Step 6: Final answer
    x = 15,484.75

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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.