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Finding the Fourth Proportional to 18,969.96, 28,431.90 and 13,424.94

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Solution

The fourth proportional to 18,969.96, 28,431.90 and 13,424.94 is: 20,121.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,969.96 : 28,431.90 = 13,424.94 : x
  2. Step 2: Convert to fraction form
    18,969.96/28,431.90 = 13,424.94/x
  3. Step 3: Cross multiply
    18,969.96x = 28,431.90 × 13,424.94
  4. Step 4: Simplify right side
    18,969.96x = 381,696,551.59
  5. Step 5: Solve for x
    x = 381,696,551.59/18,969.96
  6. Step 6: Final answer
    x = 20,121.10

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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.