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Finding the Fourth Proportional to 20,511.65, 30,745.59 and 8,662.97

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Solution

The fourth proportional to 20,511.65, 30,745.59 and 8,662.97 is: 12,985.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,511.65 : 30,745.59 = 8,662.97 : x
  2. Step 2: Convert to fraction form
    20,511.65/30,745.59 = 8,662.97/x
  3. Step 3: Cross multiply
    20,511.65x = 30,745.59 × 8,662.97
  4. Step 4: Simplify right side
    20,511.65x = 266,347,970.07
  5. Step 5: Solve for x
    x = 266,347,970.07/20,511.65
  6. Step 6: Final answer
    x = 12,985.21

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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.