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Finding the Fourth Proportional to 18,788.62, 28,169.58 and 9,421.88

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Solution

The fourth proportional to 18,788.62, 28,169.58 and 9,421.88 is: 14,126.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,788.62 : 28,169.58 = 9,421.88 : x
  2. Step 2: Convert to fraction form
    18,788.62/28,169.58 = 9,421.88/x
  3. Step 3: Cross multiply
    18,788.62x = 28,169.58 × 9,421.88
  4. Step 4: Simplify right side
    18,788.62x = 265,410,402.41
  5. Step 5: Solve for x
    x = 265,410,402.41/18,788.62
  6. Step 6: Final answer
    x = 14,126.13

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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.