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Finding the Fourth Proportional to 20,661.55, 28,513.02 and 11,230.12

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Solution

The fourth proportional to 20,661.55, 28,513.02 and 11,230.12 is: 15,497.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,661.55 : 28,513.02 = 11,230.12 : x
  2. Step 2: Convert to fraction form
    20,661.55/28,513.02 = 11,230.12/x
  3. Step 3: Cross multiply
    20,661.55x = 28,513.02 × 11,230.12
  4. Step 4: Simplify right side
    20,661.55x = 320,204,493.60
  5. Step 5: Solve for x
    x = 320,204,493.60/20,661.55
  6. Step 6: Final answer
    x = 15,497.61

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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.