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Finding the Fourth Proportional to 20,616.99, 28,452.14 and 12,118.99

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Solution

The fourth proportional to 20,616.99, 28,452.14 and 12,118.99 is: 16,724.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,616.99 : 28,452.14 = 12,118.99 : x
  2. Step 2: Convert to fraction form
    20,616.99/28,452.14 = 12,118.99/x
  3. Step 3: Cross multiply
    20,616.99x = 28,452.14 × 12,118.99
  4. Step 4: Simplify right side
    20,616.99x = 344,811,200.14
  5. Step 5: Solve for x
    x = 344,811,200.14/20,616.99
  6. Step 6: Final answer
    x = 16,724.61

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.