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Finding the Fourth Proportional to 11,123.80, 16,701.90 and 8,661.40

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Solution

The fourth proportional to 11,123.80, 16,701.90 and 8,661.40 is: 13,004.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,123.80 : 16,701.90 = 8,661.40 : x
  2. Step 2: Convert to fraction form
    11,123.80/16,701.90 = 8,661.40/x
  3. Step 3: Cross multiply
    11,123.80x = 16,701.90 × 8,661.40
  4. Step 4: Simplify right side
    11,123.80x = 144,661,836.66
  5. Step 5: Solve for x
    x = 144,661,836.66/11,123.80
  6. Step 6: Final answer
    x = 13,004.71

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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.