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Finding the Fourth Proportional to 18,919.37, 28,410.68 and 11,820.11

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Solution

The fourth proportional to 18,919.37, 28,410.68 and 11,820.11 is: 17,749.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,919.37 : 28,410.68 = 11,820.11 : x
  2. Step 2: Convert to fraction form
    18,919.37/28,410.68 = 11,820.11/x
  3. Step 3: Cross multiply
    18,919.37x = 28,410.68 × 11,820.11
  4. Step 4: Simplify right side
    18,919.37x = 335,817,410.08
  5. Step 5: Solve for x
    x = 335,817,410.08/18,919.37
  6. Step 6: Final answer
    x = 17,749.92

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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.