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Finding the Fourth Proportional to 72,757.56, 109,135.86 and 18,722.16

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Solution

The fourth proportional to 72,757.56, 109,135.86 and 18,722.16 is: 28,083.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,757.56 : 109,135.86 = 18,722.16 : x
  2. Step 2: Convert to fraction form
    72,757.56/109,135.86 = 18,722.16/x
  3. Step 3: Cross multiply
    72,757.56x = 109,135.86 × 18,722.16
  4. Step 4: Simplify right side
    72,757.56x = 2,043,259,032.66
  5. Step 5: Solve for x
    x = 2,043,259,032.66/72,757.56
  6. Step 6: Final answer
    x = 28,083.12

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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.