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Finding the Fourth Proportional to 18,987.51, 28,481.72 and 5,839.99

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Solution

The fourth proportional to 18,987.51, 28,481.72 and 5,839.99 is: 8,760.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,987.51 : 28,481.72 = 5,839.99 : x
  2. Step 2: Convert to fraction form
    18,987.51/28,481.72 = 5,839.99/x
  3. Step 3: Cross multiply
    18,987.51x = 28,481.72 × 5,839.99
  4. Step 4: Simplify right side
    18,987.51x = 166,333,030.74
  5. Step 5: Solve for x
    x = 166,333,030.74/18,987.51
  6. Step 6: Final answer
    x = 8,760.13

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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.