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Finding the Fourth Proportional to 13,711.12, 18,920.58 and 7,744

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Solution

The fourth proportional to 13,711.12, 18,920.58 and 7,744 is: 10,686.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,711.12 : 18,920.58 = 7,744 : x
  2. Step 2: Convert to fraction form
    13,711.12/18,920.58 = 7,744/x
  3. Step 3: Cross multiply
    13,711.12x = 18,920.58 × 7,744
  4. Step 4: Simplify right side
    13,711.12x = 146,520,971.52
  5. Step 5: Solve for x
    x = 146,520,971.52/13,711.12
  6. Step 6: Final answer
    x = 10,686.29

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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.