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Finding the Fourth Proportional to 18,987, 28,479.64 and 5,838.80

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Solution

The fourth proportional to 18,987, 28,479.64 and 5,838.80 is: 8,757.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,987 : 28,479.64 = 5,838.80 : x
  2. Step 2: Convert to fraction form
    18,987/28,479.64 = 5,838.80/x
  3. Step 3: Cross multiply
    18,987x = 28,479.64 × 5,838.80
  4. Step 4: Simplify right side
    18,987x = 166,286,922.03
  5. Step 5: Solve for x
    x = 166,286,922.03/18,987
  6. Step 6: Final answer
    x = 8,757.94

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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.