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Finding the Fourth Proportional to 11,125.80, 16,688.70 and 8,209.80

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Solution

The fourth proportional to 11,125.80, 16,688.70 and 8,209.80 is: 12,314.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,125.80 : 16,688.70 = 8,209.80 : x
  2. Step 2: Convert to fraction form
    11,125.80/16,688.70 = 8,209.80/x
  3. Step 3: Cross multiply
    11,125.80x = 16,688.70 × 8,209.80
  4. Step 4: Simplify right side
    11,125.80x = 137,010,889.26
  5. Step 5: Solve for x
    x = 137,010,889.26/11,125.80
  6. Step 6: Final answer
    x = 12,314.70

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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.