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Finding the Fourth Proportional to 20,697.12, 28,562.76 and 11,745

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Solution

The fourth proportional to 20,697.12, 28,562.76 and 11,745 is: 16,208.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,697.12 : 28,562.76 = 11,745 : x
  2. Step 2: Convert to fraction form
    20,697.12/28,562.76 = 11,745/x
  3. Step 3: Cross multiply
    20,697.12x = 28,562.76 × 11,745
  4. Step 4: Simplify right side
    20,697.12x = 335,469,616.20
  5. Step 5: Solve for x
    x = 335,469,616.20/20,697.12
  6. Step 6: Final answer
    x = 16,208.52

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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.