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Finding the Fourth Proportional to 18,698.85, 28,072.88 and 14,565.42

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Solution

The fourth proportional to 18,698.85, 28,072.88 and 14,565.42 is: 21,867.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,698.85 : 28,072.88 = 14,565.42 : x
  2. Step 2: Convert to fraction form
    18,698.85/28,072.88 = 14,565.42/x
  3. Step 3: Cross multiply
    18,698.85x = 28,072.88 × 14,565.42
  4. Step 4: Simplify right side
    18,698.85x = 408,893,269.60
  5. Step 5: Solve for x
    x = 408,893,269.60/18,698.85
  6. Step 6: Final answer
    x = 21,867.30

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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.