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Finding the Fourth Proportional to 18,764.64, 28,138.68 and 9,997.68

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Solution

The fourth proportional to 18,764.64, 28,138.68 and 9,997.68 is: 14,992.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,764.64 : 28,138.68 = 9,997.68 : x
  2. Step 2: Convert to fraction form
    18,764.64/28,138.68 = 9,997.68/x
  3. Step 3: Cross multiply
    18,764.64x = 28,138.68 × 9,997.68
  4. Step 4: Simplify right side
    18,764.64x = 281,321,518.26
  5. Step 5: Solve for x
    x = 281,321,518.26/18,764.64
  6. Step 6: Final answer
    x = 14,992.11

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1.5x scale

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.