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Finding the Fourth Proportional to 20,652.40, 28,500 and 11,699.92

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Solution

The fourth proportional to 20,652.40, 28,500 and 11,699.92 is: 16,145.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,652.40 : 28,500 = 11,699.92 : x
  2. Step 2: Convert to fraction form
    20,652.40/28,500 = 11,699.92/x
  3. Step 3: Cross multiply
    20,652.40x = 28,500 × 11,699.92
  4. Step 4: Simplify right side
    20,652.40x = 333,447,720
  5. Step 5: Solve for x
    x = 333,447,720/20,652.40
  6. Step 6: Final answer
    x = 16,145.71

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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.