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Finding the Fourth Proportional to 18,969.72, 28,428.12 and 14,790.68

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Solution

The fourth proportional to 18,969.72, 28,428.12 and 14,790.68 is: 22,165.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,969.72 : 28,428.12 = 14,790.68 : x
  2. Step 2: Convert to fraction form
    18,969.72/28,428.12 = 14,790.68/x
  3. Step 3: Cross multiply
    18,969.72x = 28,428.12 × 14,790.68
  4. Step 4: Simplify right side
    18,969.72x = 420,471,225.92
  5. Step 5: Solve for x
    x = 420,471,225.92/18,969.72
  6. Step 6: Final answer
    x = 22,165.39

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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.