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Finding the Fourth Proportional to 18,756.12, 28,109.34 and 9,972.12

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Solution

The fourth proportional to 18,756.12, 28,109.34 and 9,972.12 is: 14,944.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,756.12 : 28,109.34 = 9,972.12 : x
  2. Step 2: Convert to fraction form
    18,756.12/28,109.34 = 9,972.12/x
  3. Step 3: Cross multiply
    18,756.12x = 28,109.34 × 9,972.12
  4. Step 4: Simplify right side
    18,756.12x = 280,309,711.60
  5. Step 5: Solve for x
    x = 280,309,711.60/18,756.12
  6. Step 6: Final answer
    x = 14,944.97

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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.