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Finding the Fourth Proportional to 18,387.51, 27,581.41 and 5,239.99

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Solution

The fourth proportional to 18,387.51, 27,581.41 and 5,239.99 is: 7,860.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,387.51 : 27,581.41 = 5,239.99 : x
  2. Step 2: Convert to fraction form
    18,387.51/27,581.41 = 5,239.99/x
  3. Step 3: Cross multiply
    18,387.51x = 27,581.41 × 5,239.99
  4. Step 4: Simplify right side
    18,387.51x = 144,526,353.61
  5. Step 5: Solve for x
    x = 144,526,353.61/18,387.51
  6. Step 6: Final answer
    x = 7,860.03

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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.