Home / 13,909.96-20,850.35-5,139.28

Finding the Fourth Proportional to 13,909.96, 20,850.35 and 5,139.28

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Solution

The fourth proportional to 13,909.96, 20,850.35 and 5,139.28 is: 7,703.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,909.96 : 20,850.35 = 5,139.28 : x
  2. Step 2: Convert to fraction form
    13,909.96/20,850.35 = 5,139.28/x
  3. Step 3: Cross multiply
    13,909.96x = 20,850.35 × 5,139.28
  4. Step 4: Simplify right side
    13,909.96x = 107,155,695.34
  5. Step 5: Solve for x
    x = 107,155,695.34/13,909.96
  6. Step 6: Final answer
    x = 7,703.53

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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.