Home / 13,890.36-20,833.30-5,129.40

Finding the Fourth Proportional to 13,890.36, 20,833.30 and 5,129.40

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Solution

The fourth proportional to 13,890.36, 20,833.30 and 5,129.40 is: 7,693.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,890.36 : 20,833.30 = 5,129.40 : x
  2. Step 2: Convert to fraction form
    13,890.36/20,833.30 = 5,129.40/x
  3. Step 3: Cross multiply
    13,890.36x = 20,833.30 × 5,129.40
  4. Step 4: Simplify right side
    13,890.36x = 106,862,329.02
  5. Step 5: Solve for x
    x = 106,862,329.02/13,890.36
  6. Step 6: Final answer
    x = 7,693.27

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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.