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Finding the Fourth Proportional to 18,689.96, 28,039.80 and 7,004.12

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Solution

The fourth proportional to 18,689.96, 28,039.80 and 7,004.12 is: 10,508.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,689.96 : 28,039.80 = 7,004.12 : x
  2. Step 2: Convert to fraction form
    18,689.96/28,039.80 = 7,004.12/x
  3. Step 3: Cross multiply
    18,689.96x = 28,039.80 × 7,004.12
  4. Step 4: Simplify right side
    18,689.96x = 196,394,123.98
  5. Step 5: Solve for x
    x = 196,394,123.98/18,689.96
  6. Step 6: Final answer
    x = 10,508.00

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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.