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Finding the Fourth Proportional to 13,707.87, 18,918.54 and 7,739.79

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Solution

The fourth proportional to 13,707.87, 18,918.54 and 7,739.79 is: 10,681.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,707.87 : 18,918.54 = 7,739.79 : x
  2. Step 2: Convert to fraction form
    13,707.87/18,918.54 = 7,739.79/x
  3. Step 3: Cross multiply
    13,707.87x = 18,918.54 × 7,739.79
  4. Step 4: Simplify right side
    13,707.87x = 146,425,526.71
  5. Step 5: Solve for x
    x = 146,425,526.71/13,707.87
  6. Step 6: Final answer
    x = 10,681.86

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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.