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Finding the Fourth Proportional to 18,933.72, 28,411.92 and 7,840.56

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Solution

The fourth proportional to 18,933.72, 28,411.92 and 7,840.56 is: 11,765.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,933.72 : 28,411.92 = 7,840.56 : x
  2. Step 2: Convert to fraction form
    18,933.72/28,411.92 = 7,840.56/x
  3. Step 3: Cross multiply
    18,933.72x = 28,411.92 × 7,840.56
  4. Step 4: Simplify right side
    18,933.72x = 222,765,363.48
  5. Step 5: Solve for x
    x = 222,765,363.48/18,933.72
  6. Step 6: Final answer
    x = 11,765.54

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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.