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Finding the Fourth Proportional to 72,698.62, 109,039.49 and 20,112.20

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Solution

The fourth proportional to 72,698.62, 109,039.49 and 20,112.20 is: 30,165.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,698.62 : 109,039.49 = 20,112.20 : x
  2. Step 2: Convert to fraction form
    72,698.62/109,039.49 = 20,112.20/x
  3. Step 3: Cross multiply
    72,698.62x = 109,039.49 × 20,112.20
  4. Step 4: Simplify right side
    72,698.62x = 2,193,023,930.22
  5. Step 5: Solve for x
    x = 2,193,023,930.22/72,698.62
  6. Step 6: Final answer
    x = 30,165.97

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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.