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Finding the Fourth Proportional to 11,207.80, 16,811.70 and 8,615.80

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Solution

The fourth proportional to 11,207.80, 16,811.70 and 8,615.80 is: 12,923.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,207.80 : 16,811.70 = 8,615.80 : x
  2. Step 2: Convert to fraction form
    11,207.80/16,811.70 = 8,615.80/x
  3. Step 3: Cross multiply
    11,207.80x = 16,811.70 × 8,615.80
  4. Step 4: Simplify right side
    11,207.80x = 144,846,244.86
  5. Step 5: Solve for x
    x = 144,846,244.86/11,207.80
  6. Step 6: Final answer
    x = 12,923.70

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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.