Home / 13,878.70-20,828.99-5,119.77

Finding the Fourth Proportional to 13,878.70, 20,828.99 and 5,119.77

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Solution

The fourth proportional to 13,878.70, 20,828.99 and 5,119.77 is: 7,683.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,878.70 : 20,828.99 = 5,119.77 : x
  2. Step 2: Convert to fraction form
    13,878.70/20,828.99 = 5,119.77/x
  3. Step 3: Cross multiply
    13,878.70x = 20,828.99 × 5,119.77
  4. Step 4: Simplify right side
    13,878.70x = 106,639,638.13
  5. Step 5: Solve for x
    x = 106,639,638.13/13,878.70
  6. Step 6: Final answer
    x = 7,683.69

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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.