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Finding the Fourth Proportional to 18,687.56, 28,023.18 and 9,920.36

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Solution

The fourth proportional to 18,687.56, 28,023.18 and 9,920.36 is: 14,876.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,687.56 : 28,023.18 = 9,920.36 : x
  2. Step 2: Convert to fraction form
    18,687.56/28,023.18 = 9,920.36/x
  3. Step 3: Cross multiply
    18,687.56x = 28,023.18 × 9,920.36
  4. Step 4: Simplify right side
    18,687.56x = 278,000,033.94
  5. Step 5: Solve for x
    x = 278,000,033.94/18,687.56
  6. Step 6: Final answer
    x = 14,876.21

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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.