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Finding the Fourth Proportional to 12,161.80, 18,221.10 and 10,779.40

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Solution

The fourth proportional to 12,161.80, 18,221.10 and 10,779.40 is: 16,149.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,161.80 : 18,221.10 = 10,779.40 : x
  2. Step 2: Convert to fraction form
    12,161.80/18,221.10 = 10,779.40/x
  3. Step 3: Cross multiply
    12,161.80x = 18,221.10 × 10,779.40
  4. Step 4: Simplify right side
    12,161.80x = 196,412,525.34
  5. Step 5: Solve for x
    x = 196,412,525.34/12,161.80
  6. Step 6: Final answer
    x = 16,149.96

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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.