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Finding the Fourth Proportional to 20,912.91, 28,859.86 and 11,482.08

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Solution

The fourth proportional to 20,912.91, 28,859.86 and 11,482.08 is: 15,845.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,912.91 : 28,859.86 = 11,482.08 : x
  2. Step 2: Convert to fraction form
    20,912.91/28,859.86 = 11,482.08/x
  3. Step 3: Cross multiply
    20,912.91x = 28,859.86 × 11,482.08
  4. Step 4: Simplify right side
    20,912.91x = 331,371,221.31
  5. Step 5: Solve for x
    x = 331,371,221.31/20,912.91
  6. Step 6: Final answer
    x = 15,845.29

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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.