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Finding the Fourth Proportional to 18,989.87, 28,476.59 and 6,511.12

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Solution

The fourth proportional to 18,989.87, 28,476.59 and 6,511.12 is: 9,763.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,989.87 : 28,476.59 = 6,511.12 : x
  2. Step 2: Convert to fraction form
    18,989.87/28,476.59 = 6,511.12/x
  3. Step 3: Cross multiply
    18,989.87x = 28,476.59 × 6,511.12
  4. Step 4: Simplify right side
    18,989.87x = 185,414,390.93
  5. Step 5: Solve for x
    x = 185,414,390.93/18,989.87
  6. Step 6: Final answer
    x = 9,763.86

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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.