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Finding the Fourth Proportional to 18,866.38, 28,286 and 8,865.48

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Solution

The fourth proportional to 18,866.38, 28,286 and 8,865.48 is: 13,291.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,866.38 : 28,286 = 8,865.48 : x
  2. Step 2: Convert to fraction form
    18,866.38/28,286 = 8,865.48/x
  3. Step 3: Cross multiply
    18,866.38x = 28,286 × 8,865.48
  4. Step 4: Simplify right side
    18,866.38x = 250,768,967.28
  5. Step 5: Solve for x
    x = 250,768,967.28/18,866.38
  6. Step 6: Final answer
    x = 13,291.84

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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.