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Finding the Fourth Proportional to 18,969.46, 28,431.15 and 13,424.43

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Solution

The fourth proportional to 18,969.46, 28,431.15 and 13,424.43 is: 20,120.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,969.46 : 28,431.15 = 13,424.43 : x
  2. Step 2: Convert to fraction form
    18,969.46/28,431.15 = 13,424.43/x
  3. Step 3: Cross multiply
    18,969.46x = 28,431.15 × 13,424.43
  4. Step 4: Simplify right side
    18,969.46x = 381,671,982.99
  5. Step 5: Solve for x
    x = 381,671,982.99/18,969.46
  6. Step 6: Final answer
    x = 20,120.34

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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.