Home / 12,155.12-16,778.26-7,120.96

Finding the Fourth Proportional to 12,155.12, 16,778.26 and 7,120.96

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Solution

The fourth proportional to 12,155.12, 16,778.26 and 7,120.96 is: 9,829.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,155.12 : 16,778.26 = 7,120.96 : x
  2. Step 2: Convert to fraction form
    12,155.12/16,778.26 = 7,120.96/x
  3. Step 3: Cross multiply
    12,155.12x = 16,778.26 × 7,120.96
  4. Step 4: Simplify right side
    12,155.12x = 119,477,318.33
  5. Step 5: Solve for x
    x = 119,477,318.33/12,155.12
  6. Step 6: Final answer
    x = 9,829.38

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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.