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Finding the Fourth Proportional to 18,405.54, 27,609.21 and 5,259.87

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Solution

The fourth proportional to 18,405.54, 27,609.21 and 5,259.87 is: 7,890.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,405.54 : 27,609.21 = 5,259.87 : x
  2. Step 2: Convert to fraction form
    18,405.54/27,609.21 = 5,259.87/x
  3. Step 3: Cross multiply
    18,405.54x = 27,609.21 × 5,259.87
  4. Step 4: Simplify right side
    18,405.54x = 145,220,855.40
  5. Step 5: Solve for x
    x = 145,220,855.40/18,405.54
  6. Step 6: Final answer
    x = 7,890.06

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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.