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Finding the Fourth Proportional to 13,687, 18,888.11 and 7,399.42

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Solution

The fourth proportional to 13,687, 18,888.11 and 7,399.42 is: 10,211.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,687 : 18,888.11 = 7,399.42 : x
  2. Step 2: Convert to fraction form
    13,687/18,888.11 = 7,399.42/x
  3. Step 3: Cross multiply
    13,687x = 18,888.11 × 7,399.42
  4. Step 4: Simplify right side
    13,687x = 139,761,021.90
  5. Step 5: Solve for x
    x = 139,761,021.90/13,687
  6. Step 6: Final answer
    x = 10,211.22

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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.