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Finding the Fourth Proportional to 20,817.67, 28,728.88 and 11,866.01

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Solution

The fourth proportional to 20,817.67, 28,728.88 and 11,866.01 is: 16,375.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,817.67 : 28,728.88 = 11,866.01 : x
  2. Step 2: Convert to fraction form
    20,817.67/28,728.88 = 11,866.01/x
  3. Step 3: Cross multiply
    20,817.67x = 28,728.88 × 11,866.01
  4. Step 4: Simplify right side
    20,817.67x = 340,897,177.37
  5. Step 5: Solve for x
    x = 340,897,177.37/20,817.67
  6. Step 6: Final answer
    x = 16,375.38

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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.