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Finding the Fourth Proportional to 18,689.44, 28,045.68 and 12,134.56

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Solution

The fourth proportional to 18,689.44, 28,045.68 and 12,134.56 is: 18,209.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,689.44 : 28,045.68 = 12,134.56 : x
  2. Step 2: Convert to fraction form
    18,689.44/28,045.68 = 12,134.56/x
  3. Step 3: Cross multiply
    18,689.44x = 28,045.68 × 12,134.56
  4. Step 4: Simplify right side
    18,689.44x = 340,321,986.70
  5. Step 5: Solve for x
    x = 340,321,986.70/18,689.44
  6. Step 6: Final answer
    x = 18,209.32

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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.