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Finding the Fourth Proportional to 13,606.80, 20,390.73 and 7,751.31

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Solution

The fourth proportional to 13,606.80, 20,390.73 and 7,751.31 is: 11,615.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,606.80 : 20,390.73 = 7,751.31 : x
  2. Step 2: Convert to fraction form
    13,606.80/20,390.73 = 7,751.31/x
  3. Step 3: Cross multiply
    13,606.80x = 20,390.73 × 7,751.31
  4. Step 4: Simplify right side
    13,606.80x = 158,054,869.36
  5. Step 5: Solve for x
    x = 158,054,869.36/13,606.80
  6. Step 6: Final answer
    x = 11,615.87

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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.