Home / 12,109.15-16,709.79-8,129.62

Finding the Fourth Proportional to 12,109.15, 16,709.79 and 8,129.62

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Solution

The fourth proportional to 12,109.15, 16,709.79 and 8,129.62 is: 11,218.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,109.15 : 16,709.79 = 8,129.62 : x
  2. Step 2: Convert to fraction form
    12,109.15/16,709.79 = 8,129.62/x
  3. Step 3: Cross multiply
    12,109.15x = 16,709.79 × 8,129.62
  4. Step 4: Simplify right side
    12,109.15x = 135,844,242.98
  5. Step 5: Solve for x
    x = 135,844,242.98/12,109.15
  6. Step 6: Final answer
    x = 11,218.31

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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.