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Finding the Fourth Proportional to 20,600.70, 28,428.79 and 11,649.96

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Solution

The fourth proportional to 20,600.70, 28,428.79 and 11,649.96 is: 16,076.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,600.70 : 28,428.79 = 11,649.96 : x
  2. Step 2: Convert to fraction form
    20,600.70/28,428.79 = 11,649.96/x
  3. Step 3: Cross multiply
    20,600.70x = 28,428.79 × 11,649.96
  4. Step 4: Simplify right side
    20,600.70x = 331,194,266.35
  5. Step 5: Solve for x
    x = 331,194,266.35/20,600.70
  6. Step 6: Final answer
    x = 16,076.85

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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.