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Finding the Fourth Proportional to 38,647.06, 57,978.90 and 11,992.50

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Solution

The fourth proportional to 38,647.06, 57,978.90 and 11,992.50 is: 17,991.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,647.06 : 57,978.90 = 11,992.50 : x
  2. Step 2: Convert to fraction form
    38,647.06/57,978.90 = 11,992.50/x
  3. Step 3: Cross multiply
    38,647.06x = 57,978.90 × 11,992.50
  4. Step 4: Simplify right side
    38,647.06x = 695,311,958.25
  5. Step 5: Solve for x
    x = 695,311,958.25/38,647.06
  6. Step 6: Final answer
    x = 17,991.33

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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.