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Finding the Fourth Proportional to 13,969.20, 20,922.84 and 8,111.28

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Solution

The fourth proportional to 13,969.20, 20,922.84 and 8,111.28 is: 12,148.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,969.20 : 20,922.84 = 8,111.28 : x
  2. Step 2: Convert to fraction form
    13,969.20/20,922.84 = 8,111.28/x
  3. Step 3: Cross multiply
    13,969.20x = 20,922.84 × 8,111.28
  4. Step 4: Simplify right side
    13,969.20x = 169,711,013.64
  5. Step 5: Solve for x
    x = 169,711,013.64/13,969.20
  6. Step 6: Final answer
    x = 12,148.94

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.