Home / 13,435.96-20,121.54-7,872.78

Finding the Fourth Proportional to 13,435.96, 20,121.54 and 7,872.78

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Solution

The fourth proportional to 13,435.96, 20,121.54 and 7,872.78 is: 11,790.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,435.96 : 20,121.54 = 7,872.78 : x
  2. Step 2: Convert to fraction form
    13,435.96/20,121.54 = 7,872.78/x
  3. Step 3: Cross multiply
    13,435.96x = 20,121.54 × 7,872.78
  4. Step 4: Simplify right side
    13,435.96x = 158,412,457.68
  5. Step 5: Solve for x
    x = 158,412,457.68/13,435.96
  6. Step 6: Final answer
    x = 11,790.19

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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.