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Finding the Fourth Proportional to 20,517, 28,313.46 and 11,685

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Solution

The fourth proportional to 20,517, 28,313.46 and 11,685 is: 16,125.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,517 : 28,313.46 = 11,685 : x
  2. Step 2: Convert to fraction form
    20,517/28,313.46 = 11,685/x
  3. Step 3: Cross multiply
    20,517x = 28,313.46 × 11,685
  4. Step 4: Simplify right side
    20,517x = 330,842,780.10
  5. Step 5: Solve for x
    x = 330,842,780.10/20,517
  6. Step 6: Final answer
    x = 16,125.30

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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.