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Finding the Fourth Proportional to 18,992.99, 28,486.20 and 5,138.75

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Solution

The fourth proportional to 18,992.99, 28,486.20 and 5,138.75 is: 7,707.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,992.99 : 28,486.20 = 5,138.75 : x
  2. Step 2: Convert to fraction form
    18,992.99/28,486.20 = 5,138.75/x
  3. Step 3: Cross multiply
    18,992.99x = 28,486.20 × 5,138.75
  4. Step 4: Simplify right side
    18,992.99x = 146,383,460.25
  5. Step 5: Solve for x
    x = 146,383,460.25/18,992.99
  6. Step 6: Final answer
    x = 7,707.24

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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.