Home / 13,708.80-18,917.28-7,740

Finding the Fourth Proportional to 13,708.80, 18,917.28 and 7,740

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Solution

The fourth proportional to 13,708.80, 18,917.28 and 7,740 is: 10,680.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,708.80 : 18,917.28 = 7,740 : x
  2. Step 2: Convert to fraction form
    13,708.80/18,917.28 = 7,740/x
  3. Step 3: Cross multiply
    13,708.80x = 18,917.28 × 7,740
  4. Step 4: Simplify right side
    13,708.80x = 146,419,747.20
  5. Step 5: Solve for x
    x = 146,419,747.20/13,708.80
  6. Step 6: Final answer
    x = 10,680.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.