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Finding the Fourth Proportional to 18,978.80, 28,473.96 and 8,590.64

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Solution

The fourth proportional to 18,978.80, 28,473.96 and 8,590.64 is: 12,888.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,978.80 : 28,473.96 = 8,590.64 : x
  2. Step 2: Convert to fraction form
    18,978.80/28,473.96 = 8,590.64/x
  3. Step 3: Cross multiply
    18,978.80x = 28,473.96 × 8,590.64
  4. Step 4: Simplify right side
    18,978.80x = 244,609,539.73
  5. Step 5: Solve for x
    x = 244,609,539.73/18,978.80
  6. Step 6: Final answer
    x = 12,888.57

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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.