Home / 13,430.43-20,139.48-7,189.38

Finding the Fourth Proportional to 13,430.43, 20,139.48 and 7,189.38

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Solution

The fourth proportional to 13,430.43, 20,139.48 and 7,189.38 is: 10,780.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,430.43 : 20,139.48 = 7,189.38 : x
  2. Step 2: Convert to fraction form
    13,430.43/20,139.48 = 7,189.38/x
  3. Step 3: Cross multiply
    13,430.43x = 20,139.48 × 7,189.38
  4. Step 4: Simplify right side
    13,430.43x = 144,790,374.72
  5. Step 5: Solve for x
    x = 144,790,374.72/13,430.43
  6. Step 6: Final answer
    x = 10,780.77

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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.